The web-based Bionicle game where you control Hahli through underwater passages with the arrow keys, using the space bar to swipe at bad guys as you chase them. Be careful not to hit anything but the guys shooting at you - you'll lose points!
The online Bionicle game, where you control Kongu with the arrow keys, trying to navigate underwater tunnels without hitting any obstacles. Strangely compelling, though the turning rate is a little irritating.
The original series of microgames that last four seconds apiece, inspired on the Game Boy Advance series of microgames that started with "Mega Microgame$"
Another "wave-after-wave-of-things-to-shoot" flash game. Pretty well done. The only drawback is not being able to switch weapons instead of automatic reloading.
A new Popcap game (as of 1 August 2007), Talismania involves rotating hexagons to create a circuit of energy or something between two talismans. The goal is to make the longest path possible for the circuit. Interesting spatial relations game.
A really addictive game where you position attractors and repellers to move a missile to a destination. It took me about 2.5 hours to beat all 50 levels.