Since I am an engineer - not a programmer - I won't be developing the site, but retain services to build it.
My intent is to begin with a relatively simple site incorporating:
(*) Simple marketplace,
(*) Resource archive and a blog.
Once these functions are running well the plan calls for building a second site, fueled by investors, to develop powerful business-to-business functions.
My immediate network is pressing hard to use PHP or Python along with development tools like Adobe flex. My initial take is that OpenACS coupled with consultants may be a much better solution. But I need more experienced players to support my hypothesis.
Your comments are appreciated. Ultimately I would like to talk to a volunteer or consultant in more detail.