The PS3 and PSP are going to be great friends. Sure, they won't be able to play with each other when the PLAYSTATION 3 comes out, but they will in the future, and the possibilities are exciting. chubgians, IGN's ultimate PSP fanboy, recently wrote a massive essay on how PS3-PSP connecitivty can succeed where GCN-GBA has failed. Some of the key points to note:
* The two systems were made to work with each other: look at the XMB. Also, there's no extra cables to buy: just use the PSP's wi-fi connection, or the USB cable that's connected to the controller.
* Even without any software, you can access content on the PS3 from your PSP. With the Gamecube, your GBA cables were useless unless you had a game that supported it... and those were quite few in number.
* Accessing the Friends feature of the PS3 from the PSP will be incredible: imagine, a universal play experience on your PS3 and PSP. It's starting with games like Cash Money Chaos.