PSP Online through PS3 coming this fall | PS3Blog.net
This means I would assume that any ad-hoc PSP game you can play online using the PS3. I did something like this when I first got my import PSP, it was called Xlink KAI I think. When you go online with the PSP using the PS3 you can also use text and voice chat.
And finally the WiFi PlayStation Store for PSP is coming this fall too. To kick it off you get Mainichi Issyo Portable free. I would like to have the PS3 version of Mainichi Issyo on the North America store in English or at least in subtitles. It’s nice to see more PS3/PSP features coming, I wonder if you’ll be able to doing anything in Home on the PSP.