Most folks going down the independent consulting road typically decide whether to form an LLC or S-Corp for tax benefits and reducing/limiting liability. There are many other options out there and I emphasis this blog is neither a source for legal or tax advice, so please consult a professional in those areas.
My decision to go with an LLC over an S-Corp was based on the corporate structure (only me) and the future option to move towards an S-Corp. An LLC is just so much simpler. No need for annual meetings, minutes, employee payroll, etc. in an LLC.