Instant Contacts for Mac OS X Address Book, Google Contacts, or Entourage
Contacts Made Even Easier direct from text or spreadsheet to Mac OS X Address Book, Google Contacts, or Microsoft Entourage - in one keystroke*
I've been using this application to select, copy, and WhoPaste addresses into my mac Address Book. It works very well. I had a bit of trouble installing the program, which resides in your menu bar; but the customer and tech service was excellent. Steve wouldn't rest until we got it installed and he sent along a free license for my trouble.
Use this application with a Dymo label printer to make addressing anything on your Mac a breeze.
$10.00 for a license is well worth it. Sorry, Macs only.