It looks like the PSP might be getting some VOIP love in a future firmware update. If you hit the PSP section of Sony's CES website
(click on the controller, then the PSP icon in the sub menu) you'll see that one of the features of the PSP is the ability to chat with your friends over Skype. We haven't seen an official release on this yet but it's a pretty nice feature if it's true.
Thanks to Joystiq
for the link.