Here's a list of the features in the latest version of the toolbar:

• Look up web pages at:

1. AboutUs.org
2. Alexa
3. BuiltWith.com
4. Compete.com
5. DomainTools
6. eXavier
7. WebSiteValued
8. Wayback Machine
9. Quantcast
10. Technorati

• Search in the following search engines:

1. Google
2. Yahoo
3. Wikipedia
4. AboutUs
5. Ask
6. Altavista
7. MSN
8. Technorati
9. Alexa

• Check web pages using the following webmaster tools:

1. Backlink checker
2. Cloaking Checker
3. Google Banned Checker
4. Pagerank Prediction
5. Index Checker
6. Keyword Density Checker
7. Visual Pagerank Checker

Popularity: unranked [?]