I had just the same thing, but from the other side; I wrote
a voting system to allow users of the site
(a socce^Wfootball site) vote for player of the tournament
in Euro2000. Came in one morning, 17000 votes for an unknown
Moroccan... 10 minutes later the script is patched and I
can block by IP, or have the script block if someone votes
"rapid fire".
Had lots of fun getting people ridiculed in their
school/workplace :)
Rich