Don't listen to the fear mongers (LostDutchman is the only one so far with sound coherent advice).
I've purchased lunch in bitcoin where I live, and the food truck certainly wasn't regulated by the FTC! If all a US business wants to do is receive payment for goods or services in bitcoin, the payments just need to be documented. Hire any competent accountant to handle reporting to the IRS.
Two businesses in Seattle that accept bitcoin for goods:
http://www.richardsherman25.com
http://wizardsofcheese.com/wizardscreed.html
If you are talking about a business that processes the buying/selling of bitcoin, that's another topic and you should provide details.
If you have a business, I hope you are able to start accepting bitcoin, we need more companies to do so!
Oh, scribbles!
Thank you for the kudos!