A nifty little add-on which Internet Explorer users might want to take a look at is Snip IT. From the description on their web site:

SnipIT can be used to e-mail the selected text in Internet Explorer using the user’s e-mail client of choice. The add-on currently supports Microsoft Outlook, Microsoft Hotmail, Yahoo Mail, Gmail and default installed MailTo client in Internet Explorer as e-mail client options. Yahoo Mail Beta is not currently supported.

I can see how this would be useful as if you wanted to send a link, part of an article, or even a full article to someone all you would have to do is highlight the text, right click and send. Additionally, the ability to utilize web based email providers really makes this actually usable. Users of the Google toolbar (and other toolbars perhaps) have similar functionality, but I believe it is strickly limted to Gmail, where this tool opens it up for all the big ones.