How Brown is much too modest - he owns a website devoted to Jack the Ripper, the URL of which may be seen in my profile.
If you've been all dressed up for discussion on Jack the Ripper but have no place to go, give his site a try. It is amazing what rumors and misconceptions there are concerning this legendary figure. The site itself contains a large forum of URL's that link to other ripper sites as well (there are dozens and dozens), one of which is the Mother of All Ripper Sites, this being the Casebook.
Of course, Ripperologists just can't get enough in any venue, so we welcome the formation of a ripper discussion group on this site, provided that others may be sufficiently interested. Have a look at some of those other sites, however, so you'll know what you're in for.
Best,
Wally