Sameway you get backlinks to any other website, blog commenting, submit articles, link wheels, social bookmarking, etc... Theres no secret formula, for backlinks, it's just a matter of doing the work, or paying someone to do it for you.
Pinging works , my site got indexed by google within a day without doing anything other than activating a few plugins for wordpress. Socialize it pro, maxblogpress ping optimizer and some other related ones.
