Lessee. As far as English-language stuff goes...for diplomatic and political history, Paul W. Schroeder's The Transformation of European Politics 1763-1848 offers the best discussion of Napoleon (in my opinion, anyway). The usual military-history text for Napoleon is David G. Chandler's The Campaigns of Napoleon. Both are very large and kind of encyclopedic. The late Gunther Rothenberg wrote several excellent monographs on Napoleonic-era military history, especially with regards to the Habsburg military. For the Prussians, Peter Paret's books The Cognitive Challenge of War, Clausewitz and the State, and Yorck and the Era of Prussian Reform are all very good. That's the literature with which I'm most familiar, anyway: I'm sure Verbose, privatehudson, and Cheezy could all make recommendations for France, Sweden, the UK, and Russia!
This is of course if you're looking for academic history. Libraries are usually lousy with hobby-historian books on the Napoleonic period, and they're usually of decent quality (as far as hobby-historians go, anyway!).