Great news for Kindle 2 owners --- the version 2.3 software update includes support for rendering .pdf files.
Here is a .pdf file I copied onto my Kindle, shown in portrait mode:

And here's the PDF file shown in landscape mode:

This software update also allows for manual screen rotation!
I should also point out that they've consolidated Kindle 2 lines, and so now any purchase of a Kindle 2
comes with *global* wireless connectivity.
There is also an update for the Kindle DX , which provides for better cropping of .pdf files and increases the length of time before the Kindle switches to screensaver mode.
