Re: This is evil
@AC: this patent is different to what airlines are doing. In the example of an airline, they will increase the fare based on demand for that flight. As more people book, the fare increases. (well, it's a bit more complicated than that) . the Whitney album pricing is the same - it is based on demand for the item.
What Google has patented, is adjusting the price based on how likely the current visitor is to buy it.
The difference being if you and me both go to book a flight, we will both see the same price, as it is based on demand for the flight. But if we both go to buy something through google, we will see two different prices based on how more likely you are to buy it compared to me. (being based in Scotland you can guarantee I am considered less likely to part with my cash!). therefore they are adjusting the price based on likelyhood of you buying, not based on (overall) demand for the item.
For a while Easyjet used to store a cookie on your machine which saved the details of any flights that you had looked at, and inflated the price if you looked at the same thing twice. This may be considered prior art I guess, but I'm sure the lawyers will word in such a way to make it sound different. I believe this practice is no longer in operation though, at least with easyjet.