http://www.teamxlink.co.uk/
aparently much like the warp pipe for nintendo, it lets you trick the PS2 into thinking online is over a network and lets you play the games online. except this one apraently works for ps2, gamecube, xbox and oddly... psp.
dunno how well it will work. but words been going around at forums pointing this out. so perhaps peopel can still get some good racing online with it.