UCSD is hosting a classification challenge! UCSD Data Mining Contest.
There are cash prizes for undergraduate and graduate students (including post-docs), and it's open until Labor Day.
You get a bunch of data about customers and non-customers for training, then you classify a new person as True (a customer) or False (not a customer).
They can call it Data Mining, or CRM or anything else, it's all classification to me.
I forwarded this on to my ML students from last semester, and hopefully one or two of them will take a run at it.