Sony Computer Entertainment America has announced that adhocParty is now available to download from the PlayStation Store.
The free application for the PS3 allows PSP owners with a PS3 to connect to one another via the PlayStation Network. This means that games that previously only offered local wireless adhoc multiplayer become online multiplayer games if they support the adhocParty application.
Games that can be played in this way in the US include Gran Turismo and Monster Hunter Freedom Unite. You'll find a guide on how to get started over on the Official PlayStation Blog.
The good news is that adhocParty is coming to Europe, with SCEE telling VideoGamer.com that there's currently no confirmed date, but it will be available soon.