Donna, at Garden Walk Garden Talk has just completed a series which outlines in detail the design process.  This series is so well done I wish I would have written it. 

Click  below for a summary of the posts with a link to each.

  http://gardenwalkgardentalk.com/2011/01/21/process-of-design-the-base-plan/

/http://gardenwalkgardentalk.com/2011/01/22/process-of-design-site-analysis/

http://gardenwalkgardentalk.com/2011/01/23/program-needs-process-of-design/

http://gardenwalkgardentalk.com/2011/01/25/schematic-design-process-of-design/

http://gardenwalkgardentalk.com/2011/01/27/plan-development-process-of-design/