submit your site on 125 social bookmarking sites buy 2 get 2 free
Cheapest price of social bookmarking starting from only 4$ with Story URLs
Most of social bookmarking submission will come from pligg, some of them from phpdug, scuttle.
boost your traffic
better your search results
On top of this—and many would argue more importantly—you build links and Page Rank indirectly by building popularity for your site within the social bookmarking communities.
Social bookmarking is still an amazing resource for building links and Page Rank.