Data mining is fun!
I spent most of the weekend doing a mass conversion of a couple of forums I
help maintaining, transferring all the posts and threads from HTML files
(created by Infopop's UBB) into a database.
It's fascinating observing the weird data correlation between users and
posts. Just define some queries and the most interesting data points emerge
defining trends both in topics and time-related correlations.
Once all the posts are transferred (I'm about 30% of the way), a friend of
mine will write a Lucene wrapper around them to further enable some kind of
datamart functionality.