For homebrew, my favorite have always been like quake ports, duke nukem 3d port, beats of rage (which I will be adding to the homebrew list soon), cspsp, and hopefully soon using the pspsdk I can make some nice homebrew of my own ^_^ (like porting some Linux games I really like, like frozen bubble or bzflag perhaps). What would be killer (though not needed really since it is a ps1 game and they can be converted, but this could be legally free) is Warzone 2100 went open source free game (even the media is free) and it would rock to port that to the psp. And the gameboy advanced emulator for golden sun 1 and 2.
For online games, I think most of the best are available at your local game shop, or on the wicked built-in Playstation Network download site on the new 5.00 firmware. Check out Siphon Filter: Portable Ops. Wicked online play with custom player built maps, and if you have a microphone you can chat to your other players. Other games like this (that might be on PSN, I dunno), Socom: Fire team Bravo 1 and 2 (beware of cheaters), and some other Socom game I can't remember the name of because I haven't bought it yet. Soon though we get a phantasy stars game, and AFAIK is online as well. You can import it from playasia if you want to right now, but you better know Japanese. I hear it's pretty hard if you don't... Though I would see if there is any tunneling software for the psp (like X-Link KAI?). If there is you can probably play alot of AD HOC games over the net with that software. I know I used to play halo 1 that way on the Xbox.
Last edited by RabidWeezle; 02-04-2009 at 07:36 AM.
PSTWO Slim Silver v15 NTSC/US
PSP Slim Silver Daxter Edition 5.00-M33 custom firmware
Xbox1 60gb Hard drive all softmod with UnleashX
Xbox1 Stock HD Red/Black Case Softmod UnleashX
Fire Red GBA-SP