I have 14 pages of free applications on my android that the kids play all the time.
Angry birds, normal, seasons, and Rio. Rio is my favorite. Hubby likes Seasons best. All free. I also have the back up apps so that if my phone dies I do not lose the levels I have accomplished. I back them up every time I am about to leave the game. The backup's are also free. I play card games, board games, puzzle games, the kids like some of the more active games that remind me of mario brothes or donkey kong, there are pages and pages of free things in the market. Try them out if they look interesting.
My friend does tons of pod casts, she does Zombie ones, love story ones, comedian ones, etc...there are so many different options for you, she has an Iphone and the other "I" items.
Once you get 3 stars in each level you get rewarded by new games and levels opening up with all kinds of treats. She can even listen to her favorite radio stations anywhere.
One thing that I like to do too is Words With Friends and Hanging With Friends. The Words is like scrabble and Hanging is hangman. You invite your friends from either FB or you contact list and then you play back and forth with them. Some people play all day and some can only play when they are laying in bed at night and have a few minutes of quiet time.
It is one of those that I hated my friend putting on my phone, but I have found I enjoy it. I play about 20 games all the time on both and have friends waiting for a free spot. I don't win very often but I am getting there, I have actually won a few now.