I might do the same...I will probably use my Shure E3Cs instead of my huge but faithful Sennheisers...

Longhaul:
Pen for immigration forms
Two Washbags - I have too much stuff for just the one!
Sony Vaio Pocket and Bose QC2 headphones
Camera
A couple of magazines (usually bought at airport or lifted from lounge )

For long-haul flights, I carry on in my Mandarina Duck bag:

Bose QC2 noise-cancelling headphones, and ear plugs - very effective when used together.

Sony Hi-MD Walkman. I've not yet converted to an iPOD as I like to use Minidiscs for recording. I have MDs of music compilations of different genres (house, chillout, soul/groove) for different moods and also recordings from BBC Radio, including the Essential Selection and Essential Mix from BBC Radio 1 (now, incidentally, available in the US on Sirius) and various talk shows from BBC Radio 4.

A copy of The Economist (usually two weeks old).

Another magazine, probably one of The New Yorker, Vanity Fair, Travel & Leisure or Dwell.

A book. Preferably one that's light, breezy, and I'm already into - such as Martin Lukes - Who Moved My Blackberry?

A change of clothes, just in case checked baggage goes missing.

My own in-flight amenity kit consisting of aspirin, anti-bacterial wipes, lip-balm, toothbrush and toothpaste.

A bottle of water and maybe some fruit.

Photocopies of passport, itineries, lists of phone numbers etc - just in case I lose anything.

Most importantly a notebook and a pen. When I'm travelling, I'm always noting - for writing reviews of airlines or hotels, potential places to see, purchases etc.

I'm answering this thread because I have been in the Baltic for nearly three months. I am REALLY looking forward to going back to the states (even for just three days), so anything that gets my mind on packing is good.

The North Face (Mohawk) backpack contains the following:
passport
wallet (currently three currencies) - I don't like to sit on my wallet (Costanza)
ticket/boarding pass/itinerary
toothbrush
toothpaste
mouthwash (Listerine Cool Mint)
Dell Latitude D610
extra battery for same
Microsoft notebook optical mouse
Targus adapter to power my notebook (it does not charge, just powers?)
various pens (4-5 either blue or black)
Highlighter (green)
mechanical pencil (.5mm, full but not too full)
a few notepads (2-3, letter size)
condoms
6MB iPod - currently 900 songs and growing
Shure E3Cs
whatever magazines I have received but not read
whatever magazines/newspapers I pick up between my door and my seat
whatever NetFlix movies I have received but not watched
Crackberry - I guess nicknamed such b/c it is so addictive
alternate cell phone for destination (just add regional SIM)
all incentive program cards that I don't have memorized (you never know)
lip balm
camera - in the market for new camera very soon
a few business cards (Imigration, Customs, seatmate, FA, etc.)
business cards from others that need to go into Outlook
24hr. Fitness card (it's always in my backpack that doubles as gym bag)
workout log (small notepad with previous workouts)
bottled water(s) 1.5L, brand unimportant

That's about it.

Sam

Minidisc is still a great format ^ I have an MD head unit in my car and listen to them a lot although began to get sick of the fact I was indecisive and had to take about three boxes of MDs on longhaul flights!

Radio 1 Essential Mix ^

The new generation of minidisc (Hi-MD) allows you to fit lots more music on a single disc (which is now 1GB). Lately, I've been carrying my minidisc (NetMD version) player/recorder and four extra discs, along with my Creative 1GB Muvo TX FM for podcasts, etc.

I made an unplanned upgrade to Hi-MD earlier this year after I broke my old portable recorder, and went and bought a new one in a matter of minutes.

I'm very happy with Hi-MD. The sound quality of audio files transferred from CD via the MD Simple Burner software is very good for listening on headphones. I can also fit some 40 hours of speech in LP format on to a single disc from the audio gold mine that is the BBC Radio Player http://www.bbc.co.uk/radio/aod

Whilst it would be easier to have everything on a self-contained IPod, I'm not a huge fan of the MP3 format when it comes to audio quality.

On Internet media, earlier this year the BBC trialed a new multicast stream of all its radio & TV channels. The sound quality of the radio stations was excellent and the TV streams were very impressive. BBC TV programmes will be available for viewing online on demand next year and BBC TV channels will also be streamed live - but these won't be officially available outside the UK.

- Thinkpad T41
- ipod mini
- igo juice
- Treo 650
- Motorola V3
- (9 SIM cards)
- Foreign Currency depending on where I am going (have over 10 different ones at home)
- FF Cards (only 1 OneWorld Emerald & 1 Star Gold even though I have a lot more than that. enough to get me into lounge. the rest of the numbers are in my head or Treo. Got rid of hotel cards & rental car cards even though they show platinum or whatever status as well as they are always in the system.)
Immigration Forms (tired of writing each time, take a bunch and fill it out at one time especially on frequent countries I visit)
- MontBlanc Pen
- Extra Toilet roll, never know when you will need it especially in the countries I visit!
- DVDs (used to be netflix. since I don't live in the US anymore now whatever i find on the street or in malls in asia! )

1) Laptop
2) DC
3) iPOD
4) Battery Chargers
5) Mobile Phones

1) iPod mini
2) Bang & Olufsen A8 Earphones
3) Sony Ericsson T610

I like to keep my carryon light

Also, not strictly technology related: Pump 600mL spring water

^ I've got these as my non noise cancelling option and they are brilliant. Even when my original pair went down after 2yrs they replaced without even checking and started the warranty afresh

I've undergone a bit of an overhaul in my essential carry ons:

i) Ixus digital camera.
ii) IPAQ hx400 with 2GB of storage which covers: a couple of ebooks, the day's newspapers thanks to AvantGo, 2 divx movies, a few albums to listen to and VOIP calls home when wifi is available.
iii) Bluetooth keyboard and mouse for hx4700.
iv) 3G Phone.
v) Headphones: Some sort of Sony in ear model (I forget which)) for short haul or Sennheiser PCX250s for long haul.

When I'm travelling for myself, I don't bother to bring a laptop along any more. Who was it that said specialisation is for insects?

I'm glad that I am not the only one who appreciates the A8. They get poor reviews on the 'audiophile' websites, but for sound clarity and comfort they are king! Haven't had any issues with my current pair (approaching 1 year), but I am told B&O service is excellent. Mind you, I need new covers for the earpieces, so I might pop down to the B&O store in Sydney.

regarding the 9 SIM cards, my dad actually got someone to make us a soft plastic container with 8 SIM card slots to carry them around. he has a bunch too and so does many of our friends.

I have 4 SIM cards, but if I got any more I think I might need a carry case too!