well necuno has described it pretty much
but generally:
Whisky = Scottish
Whiskey = Irish
American whiskeys for some reason have an E in them, which is weird since I'm sure I read they where started by a scot.
Scotch isn't at all bad, love the stuff, just like the Irish ones so much more. Americans on the other hand can't make whiskey (how ever they want to spell it) for shit IMHO

