Social Bookmarking is a good technique to promote your blog or site. It adds your link with a short description that you wrote, in their database. This way other users will notice your link when searching. Make sure you add some tags, this will help users to find your link much faster. But I should advice you, to not totally rely on social bookmarking. You should diversify your linking efforts and please don't SPAM these sites! Here are some good social bookmarking sites:
del.icio.us.
StumbleUpon
BlinkList
Digg
Faves
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Social bookmarking links are great for website business promotion. The best social bookmarking sites are sites that allow people to easily post sites that they like.