Not sure if you're looking for plans for organization and whatnot, but I found this online at
http://www.livinghome.com/news/hometech/266-1.html
Between the middle and bottom layouts, I prefer the bottom as it would afford you some room to entertain clients, etc.
Man, how I'd like to be building a home office these days. Alas, I'll have to come to work like a chump. :P
