The GPRS settings I have on my Treo are:
Password: dublin (I think this is correct, but I can’t see the actual password so not sure if my memory serves me correctly on this one!)
These seem to work ok for me for using the internet, checkin email etc.
The only games I have on mine are simple card games and puzzle games. I am of the opinion that complex games on phones are a waste of money at the moment. What I want are simple, pick up for 5 minutes and then put down, games. ;)
Anyway, http://www.electronichut.com have a few card games like solitaire, blackjack etc. They also have a tetris clone which is fun. Just browse to the site using the “Blazer” internet browser and download them from there, they are only about 80k each I think.