Implementing date-based URLs

I had an idea about using date-based URLs for my blog and ran into
snags trying to implement it with pyblosxom. What I want is for
individual entry pages (normally at category/mypost.html) to be
generated in month folders, i.e., /year/month/mypost.html. Other URLs
should remain unchanged.

I tried to do this by putting posts in /year/month folders, so that
the year and month are actually categories. For example, mypost would
be in
/steve/blog/2007/08/mypost.txt

That worked for the individual entry page, but then the year and
year/month indexes were intepreted as categories so the number of
entries listed was limited according to py["num_entries"].

How can I remove that limit just on the year and year/month indexes?

Alternatively, is there a better way to accomplish my "date-based URL" idea?

Thanks,
Steve

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