Buffalo Trace did a cask-bottled tasting in Boulder last spring -- very interesting to taste the differences and then compare each to the "standardized" bottling they generally sell. Some liquor stores choose specific cask bottlings (flyertalk doesn't consider that a word; not sure what else to call it) -- Liquor Mart in town for one.
If you get a chance to do a tasting, do so!
The Woodford Reserve distillery tour was also great -- getting up close to those bubbling vats was a close to religious experience. It has also got to be one of the most beautiful distilleries in the US. Well worth a visit.