Where can I find more information about rare cognacs and scotch whiskeys?

I have several interesting bottles of cognacs and scotch whiskeys left by a friend of the family; unopened. I was wondering where I can find out more about them! I have a Burberry "Oldest Reserve Scotch Whiskey" Aged 25 years in a very nice case with a crystal stopper. Also a 15 year Special Reserve Chivas Regal bottle, as well as some special Camus and Courvoisier bottles. Can anyone help me find out more like how much they're each worth? Thanks!