I limit my wife for just 30 minutes of playing with my gadget per day.
She's just so addicted to it! (Windows Mobile I mean...)
Anyways, she loves useless games such as the following:
Memory games (like
this one)
Vexed (a-la-sokoban game),
Skinz Sudoku is also one of her favorites, but I hate sudoku...
We were both addicted for a while to
Shiftand
ZNAX- probably the best free games I've played.