nice, didn't know so many variations are there, especially the ones based on noughts and crosses.. and some of them can be played from the site itself, very nice..

there is also MetaSquares (http://www.scottkim.com.previewc40.carrierzone.com/squares/i...)

I have made one too - Square TicTacToe(https://github.com/learnbyexample/squaretictactoe)