I also agree with all of the above opinion that quality is more important than quantity. It would be great if you post or submit quality content to high PR submission sites.
Must be quality. For instance, one of my articles was linked from few Universities and it still has a descent amount of visitors on it.
One relavant link on good PR is very much worth than the 30 unrelated and spammy links. So Google always says that he will gives preference to Quality only.
Quality is more important than Quantity.. I think both are important, Quality get more backlink and good page rank, and Quantity provide good - search engine result page (SERP)
QUALITY OF THE CONTENT IS A MUST. Thats all I have to say really. If you work on your website for long enough - then QUANTITY will come in eventually. Focus on the quality at first that is what will build up a good solid reputation. Don't offer something that is already out there - it'll be pointless.