In the latest evolution of language for journalists, the Associated Press announced last week that they're changing the official AP style from "Web site" to "website." It's been controversial with journalists and language nerds, with the more tech-friendly side largely approving while others think it's a devolution.
As a former Yale Daily News editor put it to Poynter Online, "I can't tell you how many times I've changed 'website' to 'Web site' in stories – not to mention how many times I've said to reporters, 'Trust me, it's "Web site." 'They would ask why, and I would say, 'Because the AP says so.'"
Now various publications are considering whether to go with AP style in this case or not. And since this is 2010, the AP made the announcement, where else, on Twitter.