Here is my current Google Chrome extensions I use every days, hope you find something useful.
You could find your best extensions in the official Google Chrome Extensions site.
SEO Status Pagerank/Alexa Toolbar
SEO Status is lightweight. It will check the Google Pagerank (PR) & Alexa rank for every page. Using this will increase your Alexa.
Chromicious (Delicious Bookmarks)
Chromicious integrates your Delicious bookmarks with Google Chrome and keeps them in sync for easy access.
The Google Chrome SEO Extension. Make your SEO tasks easier with Chrome SEO Tools, includes ‘all’ the stats and data you need.
Displays the number of unread messages in your Gmail and Google Apps inbox. Preview mail, read, delete, archive and mark as spam!
Fast&Simple solution to save JPG screenshots of any webpage. The first extension that captures the whole page.