Flockmetrics provides analytics for signups. By giving you the data on how and why users are signing up you can make informed decisions on how to get more users.
Flockmetrics will help you understand lots about your signups such as how a user got to your site and what pages they viewed before signing up.
via BetaList http://bitly.com/1sMX2lf
by Robert Hughey (Google+)