I've put up some online Java games. Although please don't mistake me for someone who can actually program in Java, I got them from a site that has customizable java applets, and spent an inordinate amount of time tweaking them for our voltron fangeek pleasure :)
The first one is actually an old one I used to have up on a previous incarnation of this site, which I found in the depths of my pc archives, and is what gave me the idea of looking for new ones too. It's kind of like tic-tac-toe but 5 in a row and on a bigger board. You (Lion Voltron) battle against the computer (Robeast Mutilor). The second game is a simple puzzle applet which I have two picture versions of up at the moment, and the last game is hangman. I hope you like them.