I am looking to build a site and it needs to have Guided Navigation, such as on homedepot.com. Guided Navigation basically is where you have the categories on the left side that you can narrow down your search results by, with the # of items in that category displayed in parenthesis. When you click on one, it brings back the results filtered by that, and you get more categories on the left so you can drill-down even further.

Are there any CMSes out there that offer this functionality, either out of the box or as a plug-in?