So, I have some preliminary winners to announce!
If you're the author of one of the entries listed below the fold, please drop me an email with your real-world name and a postal address where you can receive a package?
No Laundry operatives will turn up on your doorstep with an arrest warrant, honest.
(Update: I am still waiting to hear from: Martin, Phil, and ecotax. And would appreciate it if Thomas Jorgensen would also get in touch.)
Our first winner is Death Star by "Susan"; a very credible stab at an ultimate weapon, and a pleasing example of why messing up the laws of physics is a bad idea.
TURTLE SHELL by Martin, because it exhibits brilliantly the failure mode of most Bond gadgets, Laundry-style.
An honourable mention goes to Thomas Jorgensen for Meta-Versal Internet Router Project (which would have been a runner-up if not withdrawn — please drop me an email anyway).
ETLA2 by Ian Mackenzie carries the authentic stench of bureaucratic procedures: are you sure you don't work for the government?
Rapid Response Motorcycle by Phil gets to be a runner-up by virtue of Case LITTLE BLUE BASTARD alone, and nearly scooped the top prize.
MALCOINS by ecotax (please confirm that you're eligible for the competition?) —Okay, here's an idea I actually wish I'd come up with for the series!
And finally LETHE by Megpie71, Because it should have been obvious!
As previously: would all winners please drop me an email at charlie.stross via gmail.com, confirming that you live in the UK, Australia, NZ, or EU, that you're over 16, and that you're not an employee of Little, Brown Book Group ... and remember to let me know your postal address.