I wrote a tetris clone named curi's blocks in python! It took a little over 2 days. It's free unless you really like it. If you really like it you're absolutely required to give me lots of money. My paypal email addy is curi[at]curi[dot]us.
Download it in a here: curi's blocks.zip
It comes with a readme with instructions to run it and key controls and such. But I'll repeat one thing here: you need python and pygame installed to play. Get them here:
I tried to make a standalone windows executable version using py2exe and it actually ran but pausing or losing would crash it. So sorry, source code only. If anyone clueful wants to make an exe or app that'd be cool (hint hint).
Oh also, post your highscores in comments!