The Sun's Whitehall Editor, David Wooding, has just tweeted that the newspaper will officially back the Conservatives at the next election. Given the paper's recent editorial stance, it's hardly surprising news. But it will still delight Team Cameron, and is a blow for Brown in the aftermath of his conference speech. I expect we'll hear more about it shortly.
UPDATE: The relevant Sun story is here, although it's still only showing the opening paragraph.