Have drivers been developed for the GP2x for any way to access bluetooth networks (for use with, say, cell phones serving as DUN hosts), or even wi-fi? This will most likely be my deciding factor on getting GP2X vs. PSP, as if the GP2X has one of those options available, eff the PSP I have an original GP32, got it shortly after it came out, and completely loved it.

Bluetooth, not yet-- but you can attach a USB WiFi adapter to the EXT port with an adapter cable or Breakout Board.

and does anything support this? some web browser, emulator, game, etc?

Sure, you can browse the net, use e-mail, all those fun things through Qtopia/GPE.