Eric Smith's Retrocomputing page - This is a veritable "home museum" covering the personal computer from the PDP-11 and the IBM 5100 onwards...
Erik S. Klein's Vintage Computer Collection - A virtual computer museum representing Erik Klein's personal collection of historical computers. The site features computer history, pictures and a message board.
James the Animal Tamer's Emulators - Emulators for the Aquarius, the TRS-80 MC-10, the APF imagination machine, the NEC Trek (aka NEC PC-6001A) and the Panasonic JR-200U PC.
Mattel Aquarius Homecomputer - All about the Mattel Electronics / Radofin computer with technical information and links.
MrBads Retro Games - A web site containing my collection of classic video and computer games.
Obsolyte - Obsolete and Elyte! - A website about the old workstations, focusing on unix systems. The only known archive of material.
The Official IMSAI Website - Vendor of the original 8080-based microcomputer. They still sell parts and are releasing a more modern release, the IMSAI Series 2, compatible with CP/M and ZS-DOS.
The Old Computer - Dedicated to all aspects of retro computing, old computers, games consoles, handhelds, games and watches.
Old-Computers.com - Contains historical information as well as collector links.
Oldcomputers.net - A historical timeline on computers dating back to 1970.
OldVersion.com - Non-profit organization serving the online community by providing old versions of various programs.
Pelikonepeijoonit.net - A Finnish collection of around 200 classic computers and game consoles, with information articles, links and even some fun.