Most Gawker sites use the classic "Capitalize the First Letter of Each Significant Word" model for headlines though io9 is a bit of a maverick since "io9 has used sentence case (except for lists) with no adverse consequences."
I admit I go back and forth between styles on my own O-Deck posts. But clearly we need to decide on one style before the universe collapses upon itself. If you choose to read the article, read the comments at your own risk. You've been warned.