I've also read a couple of good ones recently about/by moderate Republicans (admittedly a minority group here at Yahooka):
It's My Party Too by Christine Todd Whitman. Originally written in 2005, this is a call for the moderate factions of the GOP to reestablish themselves in a position of power. The best chapter is Whitman's focus on her days as head of the EPA under Bush, discussing her realization that both sides of the environmental issues had become so bitterly entrenched that almost no progress was possible. (My favorite example: a member of an environmental group telling Whitman they would rather have Clean Skies fail than give Bush any sort of environmental victory).
Write It When I'm Gone is a nice little set of interviews with Gerry Ford by Tom DeFrank. While it's not the most in depth of books (it reads like a long magazine article) it is a good look into the days when people on opposite sides of the aisle still talked to each other, even in a difficult political crisis. Ford comments on Watergate, the Reagans, and his newspapers editorials during the Clinton years calling for the GOP to back off a bit. He could see where the bitter partisanship of the whitewater scandal was leading the GOP, and didn't like it. That said, he had no personal respect for Clinton either, and thought he should have come more clean, far earlier than he did.