I like BitBears ( newbielink:http://bitbears.com [nonactive]).  I know it is ponzi/gambling, but I've made a little bit of BTC from it, and it's a neat concept for a game.  Plus, the bears are cute.

The rules I play by are these: watch the site for movement on the bears.  When they are cheap and/or moving, buy.  When there is activity, it is easy to make the 10% profit.

I don't play with more than I can afford to lose, and usually I'm playing with less than 1 btc.  But, I've made a little bit of BTC from it, and it is a lot more fun than some of the other gambling sites or free bitcoin sites.

There is another site like this, newbielink:http://bitcoingold.com [nonactive].  It was beyond my spending limit the last time I checked, but it followed a similar formula.