Bartering your services won't help, either. The value of noncash items must be determined and then counted as income. Putting your money in a foreign bank to earn interest won't cut your tax bill either. If it's in your name and you can get to it, it's considered income. Even that $50 bill you found at the bus stop counts.
And don't think for a minute you can get away with some underhanded ways to make a few extra bucks without paying up. The IRS says that embezzlement and swindling proceeds are taxable, too. The tax folks don't care if you steal it, as long as they get their piece of the action.