This is a scholarly page
http://members.aol.com/lieberk/welc_old.html
with links to many useful websites for Dante studies.
This website
http://www.princeton.edu/~dante/
is especially good to get a sense of what is being discussed about Dante today.
This website
http://www.italnet.nd.edu/Dante/
shows what early edition of Dante looked like.
