Are social bookmarking sites the best source of traffic for a niche blog?

[GIR]

I don't think that social bookmarking works that well, because all it is is a very short traffic spike.

[andrewjgitt]

I use this one to easy submit to social bookmarkings..
it might help: http://www.stashy.com/poster/

i'm not sure i understand what this does exactly. I'm looking for something that each time you make a blog post it automatically submits article to all social sites, is this what this does? if not, is there some service that does?

[beacon]

yes, just post something interesting and your traffic will increase significantly.