I knew I had seen more on this than the DFL thread:
http://www.the-underdogs.info/forum/...ic.php?t=46858
http://www.tnaaf.org/showthread.php?t=48
Apparently the guy is already using OCR (which pretty much defeats the CAPATCHA idea) and the rest of the points I made earlier have similarly been addressed. I apologize for sounding like a broken record, but in all honesty: everything I've seen suggested here has been tried before.