My business acumen peaked with my newspaper-route in the 7th grade so bear with me...
I was talking to a wealthy buddy a few months ago and he asked me why I don't have an LLC for the contract flying I do. He asked me a few questions about my monthly income and expenses then, 30 minutes later, handed me a sheet of paper showing items I could legally run through the LLC to lessen my tax burden. Without getting the least bit "creative" it showed a net income increase of over $10,000. When I thought about it some more, I realised every person I know who makes LOTS of money (i.e. the people all of us PT91 guys fly for) have LLC's. Once I got the green light from my accountant I started the paperwork.
My job situation is unique so it might not make sense for everyone. Definately worth a call to your CPA or a tax attorney, though.