BuzzFeed Article: 5 Reasons Why Vincent van Gogh was Jack the Ripper
Provides a quick look at some of the evidence, including a handwriting comparison.
http://www.buzzfeed.com/dalelarner/5-reasons-why-vincent-van-gogh-was-jack-the-ripper-ascd

Academia.edu: Synopsis for Vincent Alias Jack
I have provided a short summary of the book here and also a paper on the details of how Van Gogh killed his father.
http://vincentaliasjack.academia.edu/DaleLarner

Casebook.org
The best place to find info on the Jack the Ripper murders: victim photos, articles, Ripper letters, and much more. Also, follow the discussion about VINCENT ALIAS JACK on the Casebook.org forum at: http://forum.casebook.org/forumdisplay.php?f=12

Unexplained-Mysteries.com
For everything mysterious, this is a fun site filled with lots of curiosities. Join the discussion about VINCENT ALIAS JACK on their forum at:http://www.unexplained-mysteries.com/forum/index.php?showtopic=227654

True Crime Uncensored
The legendary Burl Barer interviews True Crime writers.
Fascinating interview of Dale Larner about VINCENT ALIAS JACK.
http://adoraburl.typepad.com/vincent.mp3

The Times
Newspaper archive for London news of the past.
http://www.thetimes.co.uk/tto/archive/

National Archives of the UK
Look up police records and Ripper letters.
http://www.nationalarchives.gov.uk/

The Van Gogh Museum
http://www.vangoghmuseum.nl/vgm/index.jsp?page=425&lang=en

The Van Gogh Letters at the Van Gogh Museum
Comprehensive and complete.
http://vangoghletters.org/vg/letters.html

The Van Gogh Letters at WebExhibits
Another English translation of the letters.
http://www.webexhibits.org/vangogh/

The Van Gogh Gallery
Lots of Van Gogh info, paintings and drawings.
http://www.vggallery.com/index.html

The London Typographical Society
Old maps of London.
http://www.topsoc.org/home