PS3 moves and shakes amazon.com sales charts

The PS3 80GB Motorstorm Pack was ranked 105 on the amazon sales charts. Now, it's at number 18. This means sales or the 80GB model have jumped 483%. A pretty impressive jump -- and we expect sales to grow. Sony's $100 price drop is making the system that much more attractive to consumers. How will they respond to the $399 40GB system when it releases in a few weeks?

Note: amazon.com sales charts are updated hourly.

[Thanks, Random1448!]