As Ben Brogan so rightly says, the potential for egg-on-face with this is huge, but since everyone else is at it - well, Iain Dale anyway - here's my current take on where things stand in the Gordon's Government stakes following John Reid's surprise exit.
Prime Minister: Gordon Brown
Deputy Prime Minister: Alan Johnson
Foreign Secretary: David Miliband
Chancellor of the Exchequer: Jack Straw
Home Secretary (Minister for Homeland Security): Alistair Darling
Lord Chancellor (Minister of Justice): Hilary Benn
Leader of the House of Commons: Geoff Hoon
Nations and Regions Secretary: Peter Hain
Environment and Energy Secretary: Yvette Cooper
Defence Secretary: Douglas Alexander
Education Secretary: Hazel Blears
Health Secretary: Caroline Flint
Trade and Industry Secretary: Ed Balls
Transport Secretary: Stephen Timms
Work and Pensions Secretary: Ruth Kelly
Culture Secretary: James Purnell
International Development Secretary: John Denham
Local Government and Communities Secretary: Jacqui Smith
Minister for the Cabinet Office (Social Exclusion): Andy Burnham
Leader of the House of Lords: Lord Falconer
Party Chairman: Jon Cruddas
Chief Secretary to the Treasury: Ed Miliband
Chief Whip: Nick Brown
The following will be leaving the Government:
The big thing I'm unsure about is Deputy PM. I'm not sure Brown wants one, but if Alan Johnson wins the deputy leadership as expected, I think he'll be obliged to have one. This is why I've said all along that Jon Cruddas, who doesn't want the title, is really Gordon's candidate.
I've earmarked a new job for Peter Hain which effectively amounts to overlord of devolved administrations. This is essentially a beefed-up version of his current role as Welsh and Northern Ireland Secretary, taking in also what is now the very thorny issue of relations with the Scottish Parliament.
I thought long and hard about Margaret Beckett, the great survivior of Labour politics. I think Brown will reluctantly ask her to step aside for now, but I wouldn't be surprised to see her back as Leader of the Lords after a General Election.
Finally, I think this is a work in progress as much in Gordon's mind as in everyone else's, and the nature of politics being what it is, the situation will almost certainly change between now and the end of July - so expect to see the odd update from time to time.