Well del.icio.us helps because first of all you get a backlink from them and secondly you get backlinks from people who quotes things from them
To view links or images in this forum your post count must be 1 or greater. You currently have 0 posts. i dont know weather delicious is such helpfull as digg, but i had a website that gone from 0
PR to 5
PR after lots of people digged it (around 3k people)