hey have you read about this?

Sony released adhocParty beta today in japan
for what i gather it's kinda like xlink but using a ps3
you connect you psp to your ps3 and can play any game that supports adhoc with people from your friend's list with their psps connected to ps3.

sure u need a ps3 and in case of wipeout you're probably better off playing pulse or hd but it's still nice,