This is old news (in more ways than one), but the AP Stylebook now officially endorses “website” as the one-word term for, you know, websites. The Wired Epicenter blog has a nice write-up:
Of course, the cool kids have been tossing around “website” for at least a decade. But that’s the way it is with usage: Even when it does happen, it takes a while for language disruption to become a middle class value.
The added emphasis is mine.