I would not carry copies of my credit card numbers, as this greatly increases the risk for fraudulent use of your cards and possibly cancellation of your card during your trip. Not to mention identify theft (which would be facilitated with the copy of your passport).

Instead, I jot down the telephone numbers (toll free and standard) for reporting lost/stolen cards on the back of my passport photocopy. If the cards are compromised, simply call the bank and they will have no trouble finding the account no. Ditto for your Palm/organizer - store the telephone #s, not the card #s.

I would not store sensitive info (e.g. credit card #s) in an internet email account (i.e. hotmail) as it is possible that your friendly internet cafe terminal may have a key logger which would permit access to your accounts by unsavory types. However, this would still be an excellent place to store emergency contact #s, bank tel #s, itinerary info (including hotel confirms) etc.