Okay,
so here it is!
QtEmbedded compiled for the Kindle, all packaged up for the Kindle 2 and DX (thanks to the great package tool by Igor and Jyavenard)
I've only been able to try this out with v2.3 software. It's also only been able to try it on a Kindle 2 Global Wireless and a Kindle DX U.S. Wireless. It seemed to work, but there are no guarantees (and the next update could easily cause a problem).
Normal disclaimers about bricking your Kindle apply.
The Qt platform and plugins are free to use for Kindle app development. I'll be putting up a simple sample app with source code and a few scripts to go along with the packager soon.
I'm also including a Sudoku game, which is really great for this platform.
Please let me know how it goes for you.
Darron