Via a tweet by @jasonsantamaria comes an interesting list of board game suggestions,1 most of which I'd never heard of.
The two that jumped out at me are Forbidden Desert, sequel to Forbidden Island, and Hanabi.
Board Games on Your iPhone or iPad permalink
A lot of board games make for great iOS games. The reviews on some of these look great - and for a fraction of the price of the full board game you can play and practice strategies on your iPad:
What board games (iOS or regular) are you looking forward to playing over the holidays?