As you know by now I love the fields feature of the 2005 series of products from Autodesk.
For those just learning how to use these features in their titleblocks, Chris Yanchar has a great example just posted to his ADT blog, titled "Create Your Own Titleblocks in ADT 2005 using fields". Don't let the name fool you these same features work for straight AutoCAD too.
Keep up the great work Chris!
happy cadding...