Single cask single malts are just that, whisky from only one single cask from one distillery. (maybe with some water to get down to a specific %ABV).
Single malts on the other hand are usually "vatted" blends of many single malt casks from the same distillery. The age on the bottle is the age of the youngest whisky in the bottle. A 12 yr old could, for example, have many casks older than 12 years married together, but the youngest is 12 yrs. The casks need not be all the same. They could be a mix of sherry, bourbon, 1st fill, 2nd fill, etc. They are mixed to get a specific, consistent, flavor profile. In the case of the Ardbeg Uigeadail, they add sherry casks to alter the flavor profile. The Uigeadail is a fantastic malt BTW!
A "vatted malt" or a "vatted blend", like JW Green and Wild Scotsman 15, is a vatted blend of multiple single malts from different distilleries.
A blended scotch is a blend of one or more single malt whiskys with other (not malted barley) grain spirit added as well.
Hope that helps.
As for the marrying, some distilleries mix the different spirits together and let them sit and "marry" for an additional period of time before bottling. It could be weeks to years, and it could be back in casks, or metal vatting chambers
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Last edited by TheEtherMan; 01-02-2011 at 06:43 AM.