I’m still loading my Kindle up with free stuff. I haven’t bought a single ebook from Amazon yet. I just re-discovered the 2007 Nebula page at Fictionwise, which lists a bunch of Nebula-nominated stories from last year that are available from them for free.
And I also just noticed that Fictionwise has a number of magazines available in Kindle-compatible formats, including Analog and a few other SF and mystery magazines. I’ve been somewhat disappointed in Amazon’s selection of magazines for the Kindle; they’ve only got 11 magazines available, and none of them are primarily fiction magazines. I may decide to try out a couple of magazines from Fictionwise and see if they work well on the Kindle.