Found a site today when I went searching for brain games so that while I'm mindlessly wasting time on the computer in the evening (after I've read for educational purposes, of course) I can be improving my brain power. That's important stuff, you know.
I found this one site with a bunch of different games, lots similar to ones we played as kids, but now for grownups... Remember Memory or Mastermind? Yeah, they're here. I especially liked the guess-the-flag game, and they had some code to copy it to your blog, so here it is for you to play. Enjoy!