Ubiquity from Mozilla Labs

Still copy pasting links to send via Email? Upgrade your Firefox with Ubiquity now and experience the full power of Web 2.0!

Ubiquity for Firefox from Aza Raskin on Vimeo.

Some of my favorite features:

• Post to Twitter. You can also post the URL of the current page you are browsing.
• Send embedded Google Maps using Gmail.
• Dictionary, spell check and thesaurus.
• Search Wikipedia, IMDB, Google and Yahoo as you type the word.
• Translate only portion of text on a foreign site without reloading (my must have when playing Korean based MMORPGs).

Learn more and try it out at http://labs.mozilla.com/2008/08/introducing-ubiquity/

Finally a word of caution this is a very alpha-release, sometimes it still breaks especially when interacting with 3rd-party APIs.