Would You Like to Play a Game?

I could really use some recommendations for some computer games to play while I'm at work, Free Cell and Spider Solitaire can chew up the time just fine, but I could use a little variety, but when I go looking at game sites, I'm just not seeing anything that grabs my attention.

I'm not looking for something very involved (like say, World of Warcraft), I'm not looking to invest hours into something complex. Just a little distraction. Nothing web-based, either, I need something for those times I can't connect to the Internet.

Any ideas?