Some guy I don't know sent me this video on youtube: http://www.youtube.com/watch?v=U4-D0AVVPKw
It basically talks about how this barter network progressed after the meltdown in 2008. But what called my attention is the last part of it, where the news anchor says that The Barter Network provides legal advice, and even IRS forms, for those willing to work with bartering.
Somebody interested in running a legal bitcoin business in US may try to contact them. As bitcoin is not official money, I suppose the same laws that applies to bartering applies to bitcoins.
If you happen to do it, consider compiling a basic "instruction-guide" for others to follow and post here in the forum.