heres a definitive list, while it doesnt contain all artists, this is a good list to start with if you're looking to break into it. ive been involved with the demoscene and the chipscene since 97, so over the years i've developed a pretty huge collection of the stuff. some of this might be a lil harder to find, but all of these artists are worthwhile, sorry if i left anybody real important out, its by no means a complete list but merely a point of reference.
4mat
8bitweapon
8-bit
8 bit betty
6955
alexi eeben
alex mauer
an0va
ay riders
baron knoxburry
bit rat
bit shifter
blitz lunar
bodenstandig 2000
bokusatsu shoujo koubou
bubblyfish
captain tortilla
cheap dinosaurs
chromix
covox
coin
ctrix
cow'p
david sugar
deafguy
disrupt
divag
dj scotch egg
dong
drop da bomb
dubmood
duracell
eat rabbit
eight bt
fighter x
glomag
goto80
gwem
hackurl
hally
heosphoros
k9d/starpause
kodek
kplecraft
kreese
kulor
lee du caine
little-scale
lo-bat
maktone
memblers
minikon
minusbaby
naruto
nesmetal
norrin radd
nullsleep
pasan
patric catani
phlogiston
piko block
protodome
purple motion
puss
quarta330
ralp
ram rider
random
receptors
role model
rugar
rushjet1
sabrepulse
sach
saskrotch
sergeeo
shitbird
shnabubula
sidabitball
snoopdroop
snowrobot
spamtron
strobe
sylcmyk
syphus
teamtendo
temp sound solutions (my personal project)
the hardliner
timeheater
tom woxom
trash80
tree wave
tugboat
usk
vim
virt
xik
yerzmyey
ym rockers
ymck
zabutom
zan-zan-zawa-veia
zebra
zx spectrum orchestra
some good netlabels to check out
http://www.iimusic.net... - pause netlabel, home of many newer artists such as myself, phlogiston, disasterpeace et al
http://www.inpuj.net... - one of, if not the oldest netlabels releasing 8bit style music
http://www.ubiktune.org... - progressive chip label of the year for 2010 and 2011 hands down, dont sleep on it
http://www.ptesquad.com... - pterodactyl squad, lots of great stuff here too
http://www.8bitpeoples.com... - the old standby, hehe