For new Vita owners: here's the free stuff to get on the North American store. Log into your PSN account using any of the links and then add them to your queue to download once you have your Vita handy.
PS Vita Games
Welcome Park (preloaded)
List Updates History
2013-10-30.20 -- added Crazy Market.
2013-08-21.09 -- added BreakQuest: Extra Evolution
2013-06-04.22 -- added Paint Park Plus and Toro's Friend Network.
2013-06-03.14 -- added Imaginstruments.
2013-02-16.0921 – added PS Home Arcade.
2013-02-16.0920 – initial list.