Aside from slashdot, various Usenet newsgroups and mailing lists. May not seem obvious but AOL had a number of moderated discussion areas, as did CI$ and Fidon

Aside from slashdot, various Usenet newsgroups and mailing lists. May not seem obvious but AOL had a number of moderated discussion areas, as did CI$ and Fidonet. Not sure if any of those are archived. If you're looking for finance (valuations and business models) discussions I'd look into Yahoo Finance and other day trading boards of the era. A lot of the trade publications vaporized in the resulting implosion, including their archives. Industry Standard was the best business of technology magazine, maybe Wired but it was more fanboi. Internet World wasn't too bad but started imploding early (maybe 1999).