I am currently developing a small RTOS kernel (initially) targetted at the STM32. It’s just for fun, nothing serious so far. I intend to write a few words of my daily/weekly progress here:
http://embedded-sparetime.blogspot.com/
If anyone is interested you’re more than welcome to comment!
Nice 
I’m developing my RTOS too, but for the ARM7.
As a proof of concept it is currently used in my mp3 player
(video here http://www.youtube.com/watch?v=5PQ1JJcI … re=channel)
I still remember the first time I got it to blink two leds from two threads…
:roll:
I’m really impressed! You are way ahead of me 
The GUI design is nice, slightly inspired by the iPhone, maybe? I am heading towards a project somewhat in the style of yours, but my spare time is simply too limited… I have a proper context switch working for the Cortex M3 now, so that’s a good start anyway.
I’d love to see how your project evolves!