Please recommend a recent book that summarizes and critiques the current state of knowledge and speculation on PIE and older proto-languages. (book, please, I will have no electronic contact with the world for 2 weeks.)
Benjamin Fortson, Indo-European Language and Culture: An Introduction
James Clackson, Indo-European Linguistics: An Introduction
Both are recent, well-balanced treatments by scholars of repute.
That's mostly just Greek, but maybe you'll find this useful: Encyclopedia of Ancient Greek Language and Linguistics, G.K. Giannakis (ed.). Also -- but this is more research, not review -- Pre-Greek by R.S.Beekes, trying to reconstruct the non-Indo-European substrate. And maybe his Comparative Indo-European Linguistics: An Introduction.
My pick would be:
Mallory, James P., and Douglas Q. Adams. The Oxford Introduction to Proto-Indo-European and the Proto-Indo-European World. Oxford University Press on Demand, 2006.
There is a great lexical material inside, including sub-groupings of Indo-European e.g. Graeco-Aryan etc. The style of writing is literally 'easy reading'. I like the book a lot and so do people who bought it if you judge from the reviews.