PS3 owners in the U.S. get to choose 2 of the following 5 games:
Super Stardust HD
Wipeout HD+ Fury
If you are a PSP owner, the choices are:
The downloads will be available for 30 days after the PlayStation Store is restored, but Sony has not given a set date for that yet except that it will be before the end of the month.
Additionally, Sony is giving away "Ooblag�s Alien Casino" PSN game to all affected users, as well.