... and on the top of the list, the first thing you click as a part of the filter, is a hierarchical locator: Home Components -> Video Cards & Video Devices ->

... and on the top of the list, the first thing you click as a part of the filter, is a hierarchical locator: Home Components -> Video Cards & Video Devices -> Desktop Graphics -> Cards Search Results: "GPU" The tags system works for specific areas. For example, tags in photo management apps are great. But they don't really work across separate domains, so what you want is top-level hierarchy, and, where needed, tags for the subtrees. That's how existing tag systems work.