I went with the ThinkPad option in the end - the wily denizens of the computer souk managed to upsell me from the ThinkPad Edge 11 to a fully fledged X200S that looks like you have to wear a tie to start it up. Next step, clear up my data enough to look at moving my non-Windows activities over to the new 'pooter. I'm assuming I'll run OpenSUSE Linux on the new machine again, unless anyone has a good reason not to.
I noticed at OpenTech that not only did something like half the presenters bring a Mac (and as someone on twitter observed, forget the VGA adaptor for the overhead projector), but at least half of the Mac users were running Ubuntu on them. Everyone else seemed to be Ubuntu-ing as well except for one Fedora and one Debian (I think) user. Nobody, but nobody, ran Windows. (Actually I think I caught sight of a netbook running XP at some point but the owner covered it up sharpish.)
Also, this looks handy. No more £1 Webcheck lookups!