Beginner's Guide to UI Add-Ons

If you're looking to start creating custom user interface add-ons for WoW, mmhell.com has written a handy guide, that takes you through the process of creating your first one by using a simple clock add-on as an example..

The guide is very user-friendly, but some working knowledge of XML is a plus, and a basic familiarity with scripting won't hurt, either. If you're a true novice, the site also has a more general beginner's guide to modding in general that might be a better place to start. And please, no more Chuck Norris add-ons, as much as I love the guy.