A new project for BOINC has emerged at http://www.nano-hive.org/atHome/

Account creation form: http://www.nano-hive.org/atHome/create_account_form.php

It is at the moment in Beta testing however it does say that it's account creation will be open in a few weeks.

One to keep an eye on.

I have signed up for their mailing list so i'll keep watching my inbox.