The Christopher Marlow Society
http://www.marlowe-society.org/
Website with a wide range of resources pertaining to Marlowe's life and work, as well as links to similar sites.
Full text of Tamburlaine the Great online
http://www.gutenberg.org/files/1094/1094-h/1094-h.htm
Here you'll find Project Gutenberg's online, searchable text for Tamburlaine the Great, Parts One and Two (link to Part Two near the top of the page).