Link baiting is getting new methods everyday. The latest to be added to the list are Rockets, Sleepers, Late Bloomers, Duds, Honey Pots, Screwdrivers and Pubs. Most of us have never heard of them before and that is why it's such a lovely linkbait itself.
Rockets are articles that manage to catch the interest of web sites and readers right now. The point is to be there first with the news, so that your site is the one all the other bloggers and search sites are linking to.
A sleeper is an article that does not take off like a rocket. Instead of thousands, you get a few hundred readers the first week — or even less. Still, in the long run this article may outperform a successful rocket.
A screwdriver is a piece of online software that provides a service. A search engine is an obvious example, a currency converter another.
This is just a sample of the techniques. You can read the whole post at Pandia.