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Where to post code snippets on line

As I've been learning python and using it more and more in my analysis work I've
been wondering where I can go to post and find code snippets for python. A
central file exchange, much like matlab's file exchange, would be great.

I'm thinking of a very streamlined, blog like interface, where you log in,
upload a bunch of .py files and then write a little description of what the code
does and add some tags to it.

I asked this question on the matplotlib mailing list and got the following pointers to snippet repositories:

Activestate (from Michael Droettboom)
Snipplr (from Derek Hohls)
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