Sorry, just caught up with this. It's always exciting to find someone famous in your Family Tree. I have been at this Family History research lark for about 40 years now! As some of you know I have discovered I am related to Barbara Windsor and Peter Sellers and even the Queen (she is the niece of the wife of the 3rd cousin twice removed of the husband of the wife of the great grandson of the wife of my first cousin five times removed. So pretty close really!)
I also discovered that my great great great grandfather fought at Waterloo and I received invitations to all the celebrations going on both there and at St Paul's a couple of years ago plus a commemorative medal.
I have used a few sites but I find Ancestry.com (or Ancestry.co.uk) the best, though the Mormon site is very good as well.