On Wed, May 27, 2009 at 01:45:24PM -0500, Dale wrote:
> Is there something besides a captcha that can be used?  I hate those
> things because they make no sense to me.  I usually just give up when I
> encounter one of these and try three or four times with no success.  The
> ones that look like broken glass or something are the ones I don't even
> try anymore.  I can't get past one of those.
recaptcha [1] is very common at this point, offloads the problem to an
external service, supports visually-challenged users, and includes it's
own detection of brute forcing from IP addresses and subnets.

If that's not acceptable to you, I'll just deploy calculus-captcha.
calculus-captcha is best viewed on this page here:
http://random.irb.hr/signup.php
(reload a few times to see the fun they had in qualifying questions).

-- 
Robin Hugh Johnson
Gentoo Linux Developer & Infra Guy
E-Mail     : robbat2@g.o
GnuPG FP   : 11AC BA4F 4778 E3F6 E4ED  F38E B27B 944E 3488 4E85