Resources

A great tool for getting started with laying out a floor plan can be found here. (linked from needofficespace.com)

Some links to get you started thinking about effective work spaces:
Designing Effective Office Space (Residential Design & Build)
How Rooms and Architecture Affect Mood and Creativity
Aesthetics and Happiness: How Space Affects Well-Being
A Tip Sheet for Smart, Effective Office Design
Home Office - Effective Design
Smashing Magazine's Creative Workplaces
Office Design: How to Build a Better Office
60 Seconds to a Better Office Space Design
How To Give A Great Presentation
lynda.com Online Training Library

Remember to branch out from just searching text articles to other media -- look for interviews with architects, photos of effective work spaces, or even natural spaces that inspire you.