So, Pyweek 7.
What is Pyweek? Pyweek is a contest where you have one week to make a game using python.
There are around two Pyweek contests per year, but this was the first I entered.
The theme was "The length of a piece of string".
Here's a nice listing of all 54 games, with screenshots:
http://www.pyweek.org/7/entries/
How do you play them?
Quick instructions:
1) Download and install Python using this file:
http://www.python.org/ftp/python/2.5.2/python-2.5.2.msi
2) Download and install Pygame using this file:
http://www.pygame.org/ftp/pygame-1.8.1release.win32-py2.5.msi
(install it in your python25 folder where you installed Python)
Some games require modules other than Pygame. Modules I've heard are being used are Pyglet, Pyopengl, Chipmunk (physics), Numeric.
One week? What kind of game can you make in that amount of time?
As an example, you can take a look at my own Pyweek game:
http://www.pyweek.org/e/Rambo/
And since I know half of you won't bother installing Python and Pygame for it, here's a youtube video where I play through it.

For those of you interested in playing my game, I recommend that you avoid watching this video, as it will spoil the puzzle elements.
http://www.youtube.com/watch?v=R-1CP0f0PEE
And here's a few screenshots from other games:


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Python really wasn't made with compiling EXEs in mind.