Personally a bit disappointed that the ST reference books we're getting now all seem to be aimed at children/younger readers (i.e. thios book and the recent Enterprise tour book by Okuda). They just don't do anything for me, but I'm happy that the younger Trek fans have them.
Miss the technical manuals, and episode guides and such. And before someone posts it: I do realize the reasons why we don't see those anymore, and why we probably won't anytime soon.