I maintain three separate bank accounts (not brokerage accounts) with three separate ATM cards. I can transfer money among these accounts via the internet (I will have a separate post later for "Technologly on the Road"). I do a monthly auto-transfer from a brokerage account to one of the bank accounts (e.g., if one of my accounts got cleaned out by a hacker or some kind of fraud, it would not hurt that much). I also have one credit card which I rarely use due to high fees and fraud issues related to using any credit card in a developing country. All of my banks are aware that I am traveling in Asia.
I also maintain a Paypal account that funds my Skype account. And I figure it might be handy if I need to pay a fellow traveler or receive money from him. Also, the one time on this trip that I reserved a room in advance before arriving in a town I used Paypal to pay for it (that was all that they accepted, which was fine with me).
I keep photocopies of all my documents in a secret email account that I never access from internet cafes. I also keep a written record, all in code, of all of my card numbers and the phone numbers for contact for things like American Express for each country I am visiting as well as the direct phone numbers for my various brokerage accounts.