I finished 1632 by Eric Flint. It was a pretty quick read for a fairly long book, and I enjoyed it. It's not quite SF, it's not quite alternate history, it's in the funny sub-genre of 'modern folk displaced to olden-times', rather like Crichton's Timeline. Overall, I would say it was well done, though it comes across as slightly jingoistic in places and also presents the idea that 'life is cheap' in 17th century Europe rather too gleefully on occasion. But what I did really like, is that it was well researched (I think) and I learnt an awful lot about the 30 years war in central Europe, whihc I prevously knew nothing about. It was in places like an entertaining history text book - which was actually the best thing about it, in retrospect.
I'm now turning to a slightly more challenging book - the final volume in Gene Wolfe's idiosyncratic Book of the New Sun, The Citadel of the Autarch. Having read the first three volumes (occasionally with some slight difficulty), I must finish the overall work before I start to forget what's been going on. Not that Wolfe spends much his time worrying if you know what the heck is going on while your actually reading it, of course. I'm hoping that in the final volume of the tetrology it will come together. (I as going to write all come together, but I suspect there's little chance of that!).