I found this resource on the IRS website and I think they are worth taking the time to watch.
Online Classroom - Video Presentation of the Small Business Tax Workshop
I highly recommend everyone watch
Lesson 4 - What you need to know when you run your business out of your home. Since we all work from home it is important that we understand how to qualify for the deductions available for a home-based business.
The video courses are very informative and are in "plain English", which is easier to understand than trying to interpret tax code or IRS publications. They even have real life scenarios and demonstrations included. They really aren't as boring as you would think!
I've been watching the videos myself to refresh my memory and make sure I'm aware of any changes.