I’m a big fan of cool software and the good people at Ambrosia Software have released a very helpful little widget (for Dashboard) called Easy Envelopes. In a nutshell, it allows you to quickly and easily print envelopes using a Dashboard widget. It is integrated into the Apple Address Book app, so it can generate an envelope for anyone who is already in your address book and it assumes that the return address should be you.

You should be able to download that widget by going here:

http://www.apple.com/downloads/dashboard/business/easyenvelopes.html

or here:

http://www.AmbrosiaSW.com/utilities/easyenvelopes/

–Pete