I recently got the Memor32 and I have to say it is awesome, It works with well with everygame. I tried looking for PS2 homebrew but there isn't much, there is a horrible SNES and NES emulator but there is a descent MAME emulator, there are some MP3 Players and DVD players and that's all I found.

 

Memor32 is a ps2 memory card. It holds 32Mb and has a USB plug. You can hook it to your computer and load software to play backups. Basically you can use the memory card in place of a modchip. Though I havent got the thing to work with the Memento software on my ps2 fat and I'm not a fan of the swap trick.