incase you dont know, guide to make PS2 as Media Player is UPDATED
it tell how to install SMS on ps2.
SMS is a homebrew (software), a mediaplayer softrware that can make your PS2 play DivX,avi, OGG, MP3 and play AC3 audio.
It also let you to stream media from network, making PS2 as the cheapest and coolest Network Media Player.
read the guide here