Since a few folk have emailed to double-check (or, having double-checked, emailed to suggest I publicise the fact) -- yes, apparently Vellum's April 2006 US release makes it still eligible for the rocket-ship this year. So if ye wanna nominate it, go ahead. And if ye don't, don't. (There's not a hope in hell of it winning, so if it's not on the ballot, hey, I don't have to spend lots of money I probably can't afford going to Tokyo (because there's sod all chance of me missing out on a Worldcon where I was up for a Hugo.))
As you were.