Today's Playstation Portable firmware update came with a little touch of Skype (except if you live in China, go figure). Once patched, the Skype option shows up under Network. I was able to pretty quickly register for a new account using the PSP and get it working in less then five minutes.
It's a pretty cool build of the software and while I'm not sure how often I'd use it around the house, I definitely plan on bringing it with me when I travel for some free calls. Also plan on abusing the hell out of it to harass Ash since it only cost me $US 10 to buy seven hours worth of worldwide Skype to phone service. (Skype to Skype is free) That's right seven hours of me rambling to Ash... can't wait!