Last week I reviewed the game Scribblenauts, which at the time was $4.99 but now is on sale for .99. At that price it's a must pickup for anyone. If you don't know what it is look for my review from last week. Here's a list of some other worthy apps on sale this week.
Peggle was $2.99 now .99 (iPhone only)
World of Goo was $2.99 now .99 (iPhone only)
Shadowgun was $4.99 now .99 (Universal app)
I have played all of these and they are all great pickups at .99. I've reviewed World of Goo and am working on Peggle. Shadowgun I am still playing but will review it when I get done. For a quick review, if you like Gears of War pick up this game. How is that for a quick review.