Registering for a Stack Exchange OpenID is a huge pain; it took
me 20-30 attempts. I ran into two problems you might want to
look into:  First, there's no indication of password policies:
• Password length   • Character repetition   • Mixture of
uppercase, lowercase, numerals and, quote, "special characters"
I tried a bunch of passwords before I hit on one that worked.
Second, 50% of the time I can't make out what the CAPTCHA
displays, so I kept getting it wrong  share|improve this
question If you'd like, I can make you a much worse registration
system. Oh, I can picture it now... –  Blender Oct 14 '11 at
1:47 Isn't there an option the play the captcha audibly if you
can't read it? I don't see why that's an issue to you. – 
MDMarra Oct 14 '11 at 1:49 There's nothing worse than when sites
don't allow some special characters in usernames and passwords.
I think Gravatar is probably the worst as I remember, lowercase
letters only. That's why I never bothered to get a custom
gravatar. –  Lance Roberts Oct 14