Mahjongg for us less-than-social types
If you like to play or want to learn mahjongg (actual mahjongg, not the ubiquitous solitaire matching game played with mahjongg tiles), but haven't got anyone to play with, here's a decent flash implementation of the Japanese version. It scores for you, tells you when you have an opportunity to make a meld or announce a win, and lists all the possible winning combinations at the bottom of the page, so it's about as simple as mahjongg gets. I've spent a couple of evenings playing now, and it seems free of bugs.
There are no instructions that I saw, but Mahjongg gameplay itself is not difficult, as it's basically a form of contract rummy with a few quirks thrown in; you take a tile and throw one back, and if you choose to make a meld using someone else's discard, you must play it openly, which will make your hand less valuable at the end of the round. The Japanese version struck me as simpler than the Chinese version I've played in the past. Hours of valuable time-wasting at your fingertips! Yay!