Not updated, important services do not work properly... Rated 2 out of 5 stars
Apparently has not been updated for a while :(
Does not work with bit.ly (and yes, I had the correct API key and user name) - all I saw was sidebar with something like "Unable to shorten link:..."
Has troubles with character encoding in gmail - I am from the Czech Republic and it corrupts diacritics in Czech web pages - try e.g. 2001: http://www.csfd.cz/film/5393-2001-vesmirna-odysea/
In message subject I get: "Vesm�rn�odysea / 2001: A Space Odyssey (1968) | ČSFD.cz"
Did not tried other services, could be a great addon though...