TGIF! Almost quittin' time but not quite yet. This week's time killers are all about having fun but with a purpose. Guilt free gaming on a Friday afternoon!

Google Image Labeler: You and your online partner view images and write tags. Each matching tag between you and your partner earns points. These tags help Google better index images on the Web. It's fast, fun and addicting.

Gwap: This site features several games to help computers get smarter and search engines return better results. There is an image tagging game like Google's Image Labeler, Tag a Tune (like Name That Tune), Squigl (teaching computers to "see") and a few others. It's fun and serves a purpose.