LetsDraw.It - Guess and Draw, Drawing Battle, Pictionary, Copy picture - online drawing games where you can compare your skill with others.
Lexica - An open source word-search game.
skribbl - Word guessing based on drawing.
Ruzzle - Ruzzle is a fun and fast-paced word game where you can challenge your friends or allow an opponent...
Drawasaurus - Drawasaurus is an online drawing & guessing game you can play with friends or strangers.
Wordbase - Wordbase - the fun, addictive and challenging game of words and letters for iPhone!