Oh man, I was thinking the same thing. Mine was going to be something along the lines of 'phptopython', where I could half document, half make a site about converting php code to python, or how to do similar things. I wanted it because I found it didn't exist when I was trying to learn Python. I figured if I knew what it was in php, it'd be easier to work on.

Then, like yours, I figured a wiki would be good, and have each page dedicated to a code snippet, whether it is "using trim" or "finding the square root of a number".

Haven't got around to it though