Is There a Mod or a Way To.................
 

I just spent a lot of money for a Mod that said I could do contests based on activity. I just wanted to award a user with the most activity for the week a nice T-Shirt with the site's graphics and name on it. I thought that would generate some interest in posting, etc.

But apparently a contest meant something entirely different to them.

Does anyone know of a Mod or method of determining who has the most posts for a given week, or some other criteria for awarding a first, second, and third place prize to the three most active users in a given length of time?