Try contracting. Seriously. Go to a local user group and talk with people who contract and see what the going rate is in your area. Its probably 2x to 2.5x of what you're getting now.
If for nothing else, you should have a business just so you can claim more expenses and reduce the amount you have to pay Uncle Sam (from my understanding, all you need to have is a profit motive -- not necessarily profits).
Plus you don't get taxed at source so you can take that extra 30%+ you get each paycheck to pay a tax person to figure this all out for you in time to save up for the tax hit at the end of the year.