If you have a smallish site, 1000 member or so, you can ban ISP ranges with "deny from atl.bellsouth.net". Don't use IP's, use host names! That handles all of the Atlanta, GA area. You would be surprised how unique some member IP ranges are.
Of course if you have 10 members using that ISP and live in that area you can't really do that but many many times, I have been able to do that.
Proxies are usually slow as hell and that's a deterrent for them.
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