Not only does this solitaire site look and feel great, it features almost 50 different solitaire games, many different backgrounds and decks, and a neat statistics module.

Now, I didn't even know there were that many different solitaire games, and since it seems that more are being added now and then I guess there are even more, but I get the feeling that this site has most of what you'll need if you're just looking to kill time online.

Robert Schultz used YUI to do the heavy lifting but sprinkled a bit of MochiWeb, PlotKit and canvas on top make the sweet graphs in the statistics window.