The coolest thing I ever made
pythonpackages.com
pythonpackages.com
I think a better metric for popularity would be a blend of activity in the source code repos, activity on mailing lists, wikis, blog postings etc. I liked djangopackages' use of a "I use this" metric because it helped me make comparisons across github and bitbucket. Much harder to gather but much more useful.
Edit: Also another issue with downloads can be seen with something like the Requests library. It has 40k downloads. Is that a lot? What do you compare it to? For me the important questions are: are people moving to it or away from it? Is it active or not? How popular is it in comparison to other libraries that do similar things?
Good luck on this project. It seems like a good start.
As for djangopackages.com stats (now called django.opencomparison.org), I plan to integrate with it via their API. So I'm sure I'll be able to display the number of "I use this" and other useful stats.
Taking bug reports?
I checked out mysqldb. It properly took me to a page with the correct capitalization, which indicates it found the package in some way: http://pythonpackages.com/pypi/mysqldb?entry=1
However, the 'View on PyPI' link goes to http://pypi.python.org/pypi/MySQLdb which is a broken link. While the module is called MySQLdb, the package is called MySQL-python, and so page is at http://pypi.python.org/pypi/MySQL-python/
Not sure how you can work that out, but hope this helps.
Man, we should really start to use a few different themes for bootstrap, all new sites are starting to look alike... a lot!