Thanks for the input everyone. I posted this question for two reasons, both tax-related:
-As tigerbalm pointed out, incorporating provides personal protection from any liabilities, lawsuits, etc.
-When you file a Schedule C, you're paying a 1/2 self employment tax on net earnings from your trading. This is in addition to your marginal tax rate on any other income you may have (wages, etc.) By forming an entity, you're not subject to this self employment tax, which could be large if you're making a lot of money.
I appreciate the links provided, good stuff!