As you may have read on the WebVisum website, the team had to switch to an invitation-based registration system. The spambot abuse attempts became such a toll on the team after such a short time already that they were forced to take this step.
However, all is not lost with this step! There are already a lot of WebVisum users out there who can invite others. So if you are not a member of WebVisum yet, but know someone who is, ask them for an invitation!
If you don’t know anyone who might have a WebVisum account already, but are reading this blog and want to try it out, please send me private e-mail at marco dot zehe at gmail. I can send out invitations so you can benefit from the CAPTCHA solving, graphics recognition and other great features this Firefox extension offers.