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I kinda like that idea, thou it would cause problems with the visually disabled >_>.

Not if it's placed within comment tags.

Didn't think of that >_<.

Is there a row for user_agent in the DB? Just curious what user_agent appears for the spam accounts.

Out of curiosity, have you tried putting a fake form above the one used for signing up? Some bots will parse that and then bugger off, leaving the 'real' form intact. This actually cut down the spam on one of my client sites from several dozen hits per hour to zero. However, that was for formmail rather than a forum, but it's worth a try.

I kinda like that idea, thou it would cause problems with the visually disabled >_>.