Thought I would pass along the link to this interesting community on Google+.
https://plus.google.com/u/0/communities/117268677470997111914
I use it mostly to find VASSAL games. Enjoy!
Looks like someone regularly posts the Kindle freebies there!
That's handy because narrowing down the freebies on Amazon's site has been painful for me, so I gave up.
Damn, I would have really like a couple of those books- the paratrooper lessons learned book looks neat.
Nice site...I'll have to keep my eye on it for sure.