3 links
PCBit Software
pcbit.com
Advanced Tetric, and AT Lite, 5 Tetris variations, including Pentix, 8 block sets to play with, and multilingual interface. Free online JavaScript Netris deluxe.
SmallGames Tetris Clone
smallgames.20m.com
This DirectX Tetris clone is only 276k and features 16-bit graphics, internet highscores, joystick support, and sound.