[gnaritas]

You miss the point, they don't regulate Bitcoin, they regulate citizens. Just because you can't stop something completely, doesn't mean you can't outlaw it. Bitcoin, like all commodities now and in the future is taxable under current law because the law taxes all income of any form except things we say you can deduct. That means it covers new forms of assets as well as existing ones. Not paying your taxes is illegal and is more than enough threat—as it always has been—to make citizens obey the law.

[jsprogrammer]

You miss the point. Bitcoin is not necessarily income. It's simply a chain of integers bound through certain mathematical operations.