Do these names bring back memories? If so, you'll really like my newest book, On the Way to the Web. Ditto, if you're a fan of technology history. As with Crosley, this is a book I'd been waiting for; it never came out, so I wrote it.
On the Way to the Wev: The Secret History of the Internet and Its Founders is a history of the Internet before the Web, and includes ARPAnet, CompuServe, DIALOG, GEnie, BIX, DELPHI, PLink, PC-Link, Promenade, AppleLink, eWorld, and all the rest--including online services before ARPAnet. I also cover Videotex and teletext in Europe and the U.S. Prestel, Mintel, et al.
"This is a thorough, entertaining, informative, useful history of how our world was transformed during my adult life." --Orson Scott Card