Sony is apparently planning to take over the communication world as well as make you spend more money to buy a new PSP Slim (the one that’s not advertised on TV or in magazines much) because the old PSP (the one that’s advertised the most) won’t have this functionality. The first time I heard a handheld console was going to have phone like abilities came from a Nintendo booth at E3 way back when. Though this DS software never showed up (it could still be in development, who knows), Sony seems like they want to be the “actual” first handheld console to support telecommunications.
PSP Skype will be free, which is a good sign. But it’s not going to replace your cell phone anytime soon, PSP Skype only calls PSP to PSP and PSP to PC.