Listing sites for SBM,Business,Classifieds

[shrigopal]

Hello,
Am new to SEO field can you please suggest me new listing sites with Good PR and no SPAM.

 

[giftssuppliers]

Stumble Upon,
Tumblr,
Yahoo Bookmarks,
Digg,
Reddit,
Folkd
These bookmarking sites would constitute better for getting a better link back as well as listing the business info too.

 

[edwina]

They are,

reddit.com
livejournal.com
stumbleupon.com
delicious.com
digg.com
slashdot.org
diigo.com
fark.com
bibsonomy.org
newsvine.com
metafilter.com
folkd.com
dzone.com
technorati.com
squidoo.com