Leave it to Slate's Jack Shafer, the master contrarian of them all, to launch a harpoon through the story. There's just one thing... in the teaser text, "nevermind" is listed as one word:
The Times' Fishy Story
Nevermind that scaremongering story about mercury-tainted sushi.posted Jan 25, 2008
By Jack Shafer
Besides being a Nirvana album, "nevermind" is a regionalism that essentially means "attention." E.g., "Pay no nevermind to the blogma you read online...those people all think the same."
The rest of us write "never mind" as two words.