Burntman -
If you want to see how many hits you had for a particular month for example, you can click on Months, then choose the type of hit you'd like stats for..
As far as referrers for an entire month.. We're working on it
Needless to say keeping referrers for 20,000+ sites for that period of time is a huge undertaking!
It can be done though.. and we're working on it.
-KC
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http://paycounter.com