As the html5 raises into a huge topic in game developement, i like to develop a html5 based game. for more information please contact me ! i m very pleased to answer your questions.
Starting from a simple game like memory, tetris or simple jump'n'run (like http://david.blob.core.windows.net/html5platformer/index.html), to get ino the techs.
Then raise to a multiplayer, i d like to resurrect some old playstation 1 or gameboy games, port them into html5.