Well it depends on what part of Asia, I usually carry a couple hundy (maybe 200) in travelers checks just as back up but use my atm/check and debit cards for the most part. You may have a few fees here and there but you would be charged to convert it anyway.
I have only been to Korea and Singapore so Im not real familiar with the exceptance of the cards in other parts of Asia.
What do ya say CD or WWW??
You'll get some good answers
(by the way I meant I use the cards through cash machines)