When I search on google for the text:

"These icons link to social bookmarking sites where readers can share and discover new web pages"

I find over 2M pages. These lead me to a plugin called "sociable" which is being used on a lot of wordpress sites to automatically put in links to social bookmarking web sites.

When we have our final partner code, we should update their PHP here, so we can be supported by them too.

Currently supported:
digg
delicious
blinklist
blinkbits
blogmarks
connotea
delirious
fark
feedmelinks
furl
linkagogo
magnolia
newsvine
netvouz
rawsugar
reddit
scuttle
shadows
simpy
smarking
spurl
tailrank
technorati
wists
myweb2

Currently NOT supported:
IceRocket Daypop BlogPulse Blodex Blogsearch.com Blogs of the Day 180n Gada CodeCubed Newzingo Flickr KB Cafe Tag Search Bloghop Oishii Citeulike Common Times Wists Scuttle LookMarks Frassle GiveALink Memeorandum Ask Jeeves LinkFilter Hyperlinkomatic FeedMarker BackFlip Yummy.printfu Diigo Quimble StumbleUpon Filangy Riffs Gibeo.net Linkroll OpenBM SearchFox Bloogz Findory Blog Top Sites Indiza Indiamarks.com Indiahappening.com