Here are some links to helpful websites and blogs that deal with the folklore of vampires. I will add new sites as I find them or have the time.
The Vampire Historian Online
Other Vampire-related Blogs
The Vampirologist – Anthony Hogg
Magia Posthuma – Niels K. Petersen
Taliesin Meets the Vampires – Andy Boylan
Dracula’s Homepage – Elizabeth Miller