It LOOKS like if you click on the tag itself you'll be able to search by the tag but people aren't using the tags much yet. We only get a couple threads started a day so then the number of folks who are going to use the specific tag are even less than that.. so it's just waiting to see how popular they are. If you click the tag it looks like that's going to be searchable though. (I could be wrong, I don't know know crap about crap.)