Plants vs Zombies
Bookworm
Scrabble
Ace Attorney series
there's also a prof layton clone-ish game called Sherlock Holmes Osborne house. I played it for 10 mins and it seemed ok. Been meaning to get back to it.
In addition to Plants Vs. Zombies, my wife is a bit fan of Mystery Case Files and Polarium. She also enjoys Scribblenauts, but she prefers helping me rather than playing the game on her own.