Yes, there is a PSN link on the Vita's LiveArea.
Yes, Angry Birds is available on PSN in a PS Vita compatible form.
The PS Vita does not have a UMD slot so it can't play those. However if you've bought a PSP game on PSN, it can possibly be downloaded on PS Vita, you'd have to check to see if it is available, you might have to wait for it to be enabled.
There's no Naruto games on the PSN store
I think so because on the PS3 it is.
Yes, the PS Vita can download a Skype app from the PSN.
nope - kane_215 (psn) follow me on twitter @young_ghillie
Only the 2nd gen PSVita slim has internal memory, 1GB.
Skype can be downloaded from the PSVita's PSN store, from the 'Social' tab.
The only ones you can play are the ones on the PSN.
There is an increasing selection of PS games, 'PSOne Classics' available on the PSN, the PS Vita has an emulation mode to play them on. Also, there are some that aren't available on the PS Vita's PSN store but are on the PS3's, which can be transferred across to the Vita via the PS3.
Sony have announced a PS Vita lite, and a Vita TV which is a screenless box that plugs into a TV and used a controller to play PSN, PSP and some Vita games. There is also the upcoming PS4.
Yes, the PSVita can access the PSN store from its LiveArea.