Edmonton Startup Semanti Corp. took their place on stage at Demo 08 in San Diego. Semanti is a Firefox plugin that sits on top of Google allowing users to search based on word's semantic meaning, the results are shown in a box above your google search results and are based on what other sites users have said belong in those categories. Check out their presentation at DEMO 08 (embeded below).
Check out www.semantifind.com to sign up for their beta.