Edited to include an overview over each company's product portfolio (ongoing effort). Most of them have so much it makes the tags basically useless.
Just when we though we finally got rid of them all they appear to have been resurrected.
adobe x 200 — about 100 software and service products, PDF, Flash, Flex, graphics and video editing, web design, marketing tools
alienware x 9 — desktop and laptop computers, keyboard, mouse, headset
amd x 136 – desktop and server CPUs, graphics cards/GPUs, chipsets
apple x 29 – a lot
asrock x 8 – home, server, and industrial motherboards, mini PCs/HTPCs, laptops
asus x 28 – desktop and laptop computers, graphics cards, screens, tablets, a phone, sound cards, main boards, external hard drives, mice, servers, DVD writers, ...
ati x 170 - should be merged into AMD
belkin x 39 – wired and wireless networking equipment, cables and converters, USB hubs, accessories
brother x 15 "We offer products and services with our experience in a wide range of fields such as "printing equipment" and "home sewing machines", "industrial sewing machines / machine tools"." – Still, printers, scanners, faxes and multifunction devices are on topic.
buffalo x 13 – NAS, cloud storage, external HDDs, optical drives, wireless routers, wireless adapters, internal PCI cards for USB etc.,
canon x 54
dell x 430
dlink x 95 (it even has synonyms!)
epson x 22
fujitsu x 9
gigabyte x 44 (possibly ambiguous?)
hp x 365
intel x 343
kodak x 4
lenovo x 189
lexmark x 17
lg x 19
linksys x 176
logitech x 77
matrox x 6
maxtor x 5
msi x 55 (possibly ambiguous?)
microsoft x 12
netgear x 89
nvidia x 410
oki x 4
panasonic x 3
razer x 13
samsung x 18
seagate x 38
toshiba x 83
western-digital x 74
xerox x 9
zyxel x 8
And these are just the classic company tags that aren't strongly coupled to a single product, like google or vmware are.
Could someone please kill them with fire? I hear the undead are vulnerable to it.
The discussion happened in the linked thread. I don't want it repeated here.