I didn't say the only ones, I said many. And your own original link verifies that per the IRS. Your new link is not federal, but state taxes.

And not paying taxes does not equal cheating. It means they follow the tax law. The left wing website that you link to ignores several facts. Such as the fact that options are an actual expense. Or that accelerated depreciation is not a loophole. It was an incentive (one that worked) to buy equipment in the midst of a faltering economy. And all it meant is that the depreciation deduction was accelerated over three years instead of five. That was a deduction they would have received in any event. Additionally, some of these "loopholes" are programs that liberals have helped create or have complained about Bush not providing more of. Such as incentives for R&D into alternative fuels, providing low cost housing, etc.

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All you need to know about the energy crisis:
ANWR Exploration Republicans: 91% Supported. Democrats: 86% Opposed.
Coal-to-liquid R's: 90% YES. D's: 78% NO.
Oil Shale Exploration R's: 90% YES. D's: 86% NO.
Outer Continental Shelf Exploration R's: 81% YES. D's: 83% NO.
Increased Refinery Capacity R's: 97% YES. D's: 96% NO

SUMMARY: 91% of House Republicans have historically voted to increase the production of America’s own oil and gas. 86% of House Democrats have historically voted against.