One thing to remember is that if you incorporate, you have to run the business like a real corporation, keeping the appropriate records, having annual meetings and corporate officers, etc so that if you are ever sued, you can prove that the corporation is a legal entity and not just a shield to protect your personal assets.
I'll second the recommendation of Nolo's materials - their corporate book has a CD that provides all the forms you need to keep accurate records required to comply with being recognized as a corporate entity.