If you own a PSP-2000 model (aka Slim & Lite), this might be of interest to you. Sony has finally brought its Skype-compatible PlayStation Portable headset to North American retailers. Sadly it will not function on the older original (fat) PSPs, and if you still want it you’ll have to dish out the slightly harsh sum of USD $30.
Worth it or not, that’s for you to decide. But it is currently the simplest way of talking to your friends on Skype via your PSP.