I'm resurrecting this feature request from [[Wikipedia:Village pump]] where it is discussed under "Wikipedia Evangelism".
The point raised was the desirability of an easy way to ask a friend to comment on the accuracy of an article, or simply to point out an interesting article to someone.
How about doing what a lot of news pages do? Add a box at the bottom of each article
[] Send this article to a friend
along with a java mailer to fire the message off and a text box to add a note. Having a linked mailer would eliminate the necessity of firing up a mail program.