Most Comprehensive Web 2.0 List ever:
Most Comprehensive Web 2.0 List – FUN 2.0
Certifyr – Certify 2.0-ishness of your website. http://www.certifyr.com/
Googlebrins – Create & share your Sergey Brin. http://www.googlebrins.com/
Isolatr – Isolate yourself from requests. http://isolatr.com/ http://isolatr.com
Web2.0validator – Screen your website on 2.0-ishness. http://web2.0validator.com/