Credit to DABK's blog for this list.

=Social Bookmarking Sites=
www.digg.com
www.stumbleupon.com
www.folkd.com
www.adusum.org
www.a1-webmarks.com
www.bookmarkindo.com

www.blogcatalog.com
www.dofollow.info
www.slashdot.org
technorati.com
www.reddit.com
www.mixx.com
www.delicious.com
www.backflip.com
www.bibsonomy.org
www.bookmarktracker.com
www.buddymarks.com
www.anything-forum.com
www.buzzflash.net
www.chaamp.com
www.socialogs.com
www.indianpad.com
www.technocrati.com
www.getitgadget.com
www.google.com/bookmarks
www.diigo.com
easymash.com
jumptags.com
mister?wong.com
www.oyax.com
propeller.com

technorati.com
reddit.com
mixx.com
folkd.com
Page Rank  
propeller.com
metafilter.com
wikio.com
care.com
connotea.org
tipd.com
weheartgossip.com

dzone.com
sphinn.com
linkagogo.com
kirtsy.com
kwoff.com
bloghop.com
mylinkvault.com
buddymarks.com

indianpad.com
spotback.com
plime.com
designfloat.com
weblist.com
fcc.com
linkatopia.com
iliketotallyloveit.com
japansoc.com
buzzup.com
scoopit.co.nz
ngopost.org
a-webmarks.com
Page Rank
oyax.com
quadriot.com
blurpalicious.com
wagg.it
uvouch.com
blogmarks.net
maple.nu
blogengage.com
graphic-design-links.com
indiareporting.com
feedmarker.com
memfrag.com
cadillactight.net
i89.us

humsurfer.com
socialogs.com
totalpad.com
solinkable.com
pfbuzz.com
websapiens.net
oopza.com
yattle.com
bringr.com
sweepsgoat.com
tedigo.net
haohaoreport.com
yuppmarks.com
craftjuice.com
newscola.com
gaddiposh.com
spicybookmark.com
bookmarkplace.com
iorkut.net
hitmarks.com

pageactive.org