i switched from reCaptcha
and started using random questions such as 1+1 or one plus one
and spambots went from 7 a week to 0 since early december.
ofcourse i also got email verificaiton on.
and those (10minutte mail accounts) dont seem to register since my webhost
is shit, and registration mails take often up to 25mins to arrive.
howewer a lostpasword mail is instant.. weird.. but wth its working