Bang-On Time - practice telling time to the minute by beating the clock.
Geospies - Identify continents/provinces/countries, etc. You pick the difficulty level.
Blobs - Fun strategy game, similar to checkers.
Wordle - Create beautiful 'Word Clouds' using your own text!
Uncross The Lines - highly challenging puzzle site. The object is as the title suggests--to make sure that no lines cross. But it's not as simple as it sounds!