These are the ones I use most:
mint, facebook, pinterest, ShoppingList (for Christmas), MyPics (picasa), Pandora, Total Baby (still use it to track the kids health info), Netflix, RelaxMelodies (white noise), and most recently BFads (Black Friday deals).
I also like the flashlight app and YardSale Mapper, and RoadNinja for road trips (tells you whats on each exit)
For games for me and the kids, we like Angry Birds, Peekaboo Barn, ABC Animals, Pet the animals, and Matching Zoo.
***Twin fraternal girls born at 35w6d in 12/2008***
Word with friends, fb, My fitness pal, Camera +, Phototouch ABC, Office Jerk (like paper toss but cooler and Ava loves it), Bubble blast, instagram, C25K, Drop 7, SportsCenter, Amazon, Gas Buddy, and the best app EVER for kids is Elmo's Monster Maker.