Watson's PriceGrabber tool got an update today to deal with the problem of the tool always falling behind when Pricegrabber.com would change their product categorizations.
Until now, I've just made sure that a new release comes out every so often to keep up with the changes at their site. But now, the nice folks at PriceGrabber have created a live 'feed' of their categories; all Watson has to do now is to get that file to have a fresh version of their categories.
Of course, the categorization isn't changing that fast. So the hierarchy is cached for a week.
Enjoy!