The circuitbenders yahoo mailing list/group and various splinter groups (Tablebeast dramas etc haha) were great for years, and at one point my own site had a comprehensive list of all circuitbending, and a lot of Noise for that matter, info/sites that existed on the internet, back when that was actually possible for a given subject. :)
+ was on some of the afforementioned forums and lists too :)
off topic but a related for me at least,
micromusic.net and
www.vorc.org used to be important and extremely active back in the day for the more chipmusic/8bit/computer side of things. I even made it to VORC news one time for releasing a track of gameboy camera drone, they were pretty comprehensive :D
One minor obsession of Newport noise friends and I circa 2000 was the OOBS Records/Joysticks site -
http://oobsrecords.tripod.com/ - never heard any of their music/noise at all (please do let me know anyone if you have any!!) but reading their absurd tour diaries i'd say was one of the biggest influences on Cementimental when I was starting out. :) One of the OOBS guys went on to massive success as Girl Talk in more recent years and I felt weirdly proud/happy for him ^__^;