I really don't care much about Skype on the PSP. For domestic calls, I have my cell phone.
On the other hand, if I were making international calls more frequently, I would definitely see the utility. I'd rather have a VOIP application on a wifi-enabled mobile phone, though. T-Mobile here in the US offers that in a limited fashion, and there are hacks out there for a few other phones...
I prefer Gizmo to Skype, though, since it's open... http:... (
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