Bob and Mark explain a little bit of what's happening:
Here's a link to the pdf of the Tax Foundation's Alaska ranking.
And they talked about it with Senator Wielechowski this morning:
When Bob and Mark talk about the pipeline being owned and tariffs, etc... they're referring to the fact that the oil line in Alaska is controlled by the Big Three oil companies, Exxon, BP, and ConocoPhilips. They charge other smaller companies a tariff to ship their oil in the pipeline. This is why Governor Palin was so adamant about the natural gas pipeline being built by a separate entity like TransCanada.
Learn more in Sarah Takes on Big Oil.