Okay, after reading the software version of this, and I am sure this have been covered before, but here we go.

What do you carry on in your bag while you fly?

iPod
Shure E5c
Apple 12'' Powerbook
Igo Power Adapter
Treo 650
Airport Express
Altec Lansing iPod Speakers (sometimes)
Book
Magazine
2 Portable 60 & 80 Gig Firewire HD
12'' Ethernet cable
6' Ethernet Cable
iPod Cable
2-4 DVD (in sleves)
Ear Plugs
2 Carabeners
Travel Wallet (all my FF Cards)
Hand Sanatizer
Breath Mints
Lock for Laptop