I'm trying to get a site indexed & in the top ten in google & I don't want to waste my time on sites that do not help get a site ranked. I know sites like digg,squidoo,hubpages are the major ones which one would be the best to concentrate on.
digg helps you get your pages indexed very fast. I have experienced that whenever a page is submitted to digg, it gets indexed by Google within 48 hours. I am not sure if it happens only to me but it does.
i think you are right because until now, google can only see 2 backlinks to my blog, and both are from digg.