Why don't you implement something to make the person signing up enter a 5 digit random number displayed on an image.. Many of the mainstream sites (like Yahoo) now have this feature to prevent bots from creating a thousand email addys at any one time. They can't seem to read images.
I could implement something similar on your site if you want.. And could have it up in a day or two..
best,
kevin
kevinale )at( prontomail )dot( com
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