Richard Matheson's 1954 I Am Legend is probably the most influential horror novel of the 20th century. Over the years I've owned various paperback editions of it, having first read it during summer break in high school. I had this Omega Man tie-in version from the early '70s.
So I started thinking about other editions of it, and while looking I came across The I Am Legend Book Archive. I love finding other horror obsessives who catalog their mania in minute detail, but I don't think I've ever seen a blog that focuses solely on one book. Pretty cool. Check it out.