MARC or metadata related programming exercises?

I recently discovered a set of mathematical programming challenges ranging
from very simple to extremely complex.
http://projecteuler.net/
I find that they are a great tool for studying Perl, because it gives me a
concrete target to work on and apply better coding techniques.

Does anyone have suggestions (or a site) for similar challenges based in
text parsing and management?
MARC related would be best, of course, but anything leaning more toward text
than math would be appreciated.

Thanks,
Mike Barrett