I wrote a little perl script that reads through the pipermail archives and lets you know whether a message is top-posted/overquoted/has long lines/excessively long signature/disclaimer attached to it.
Find the script at: http://db.ilug-bom.org.in/lug-authors/philip/bin/maillist_grouchy_old_man
See it in action at: http://db.ilug-bom.org.in/cgi-bin/grouchy-man/message_id
Where message_id is the id of a message (including leading zeroes)
eg: http://db.ilug-bom.org.in/cgi-bin/grouchy-man/014113 for a nice example from Dinesh.
Figure out what the different values at the bottom mean.
Now don't overload the server having fun.
Suggestions for improvement welcome. Requests to explain/comment the code will be met with deaf ears.