Here's a Bourbon tasting presentation run by Dave Pickerell, master distiller of Maker's Mark, that I found interesting.
I don't necessarily believe everything that Pickerell has to say, in particular the bits about which areas of the tongue taste which kinds of flavors, which recent scientific study has suggested is a bunch of hooey. In addition, keep in mind that his primary mission in conducting presentations like this is to explain and justify Maker's Mark's distillation practices. He says that he views his primary job as to eliminate bitterness from the finished product. I don't view bitterness as synonymous with bad, though, and while Maker's Mark is good Bourbon, there's a lot more out there that is more interesting.