Okay, so this isn’t exactly new (published in 2006), but I just found out about it today when I found it on sale at the local Half-Price Books store for $8. For the Pratchett fan, model-building/craft fan, and/or general geek, it is quite awesome: http://www.amazon.co.uk/Unseen-University-Cut-Out-Book/dp/0385609442 (I’m in the US, but the UK amazon link was more useful than the US version).
We’ll see how awesome I think it is after I actually attempt building it. Reading about it, it sounds like it is actually quite a challenge, considering it is just cutting and gluing paper :)