Comment Contest is a script I wrote in 2007 to pick a winning comment from a thread. I have not updated sinse taht time other than to remove commented out code and debug stuff.
I make no assertations as to how well this will work.
Lord-Matt-NucleusCMS-Stuff/NP_CommentContest
A quick and dirty fix I wrote to turn all comments on a blog post into a contest entry. The script will choose at random a winner. If I remember correctly you can also choose which comments count as entries.