Rated 4 out of 5 stars
Zemanta is supposed to work with Gmail and Yahoo. I installed the extension but I don't see Zemanta when I composed in Gmail or in Yahoo. On the lighter side, it's working with my blog but would love it better if I can also use it in my email accounts.This review is for a previous version of the add-on (0.7.1).
Email is not enabled by default. You can enable it via the Zemanta icon in the location bar, or via Preferences.