I managed to mis-type a colleague's email address when sending him an email and Mac Mail them memorised it and tried to use it whenever I typed that user's name. Here is how to remove entries:
http://email.about.com/od/macosxmailtips/qt/et_clean_autoc.htm
To give me the ability to distract colleagues all as often as possible, whilst taking as little time out of my own day, I have an 'email this page' bookmarklet set up for firefox.
Basically its a tiny piece of javascript that pops up a pre-filled email to 'staff', with the title of the page as the subject, and the url as the message body.
To create a bookmarklet, first bookmark any page and stick it in your Bookmarks Toolbar, then right click it -> properties.
Change the name to whatever you like, and the location to this:
javascript:window.location = 'mailto:somebody@somewhere.com?Subject=' + document.title + '&body=' + document.location
Ta da! Instantly share useful links / hilarious tat with the whole office.
(p.s. you can do this in Safari too - not sure about IE)
