I still use my 770 daily.
As for Pandora, it looks like its "flash" based, so it's probably not likely.
There are some hacks to get a flash 9 player on the 770, but I'm not sure how well they work, or if Pandora requires 9 or 10...
(There is a thread here on this board on Flash 9 on the 770; I can tell you it didn't work with youtube.)

Basic Internet radio streaming works well however. Using either the built in app or mplayer.
(or other apps which also work)

desiv