Well, I have looked at the Wiki page which lists about 46 different distributions to install on the PI (I have a B) that it's plain confusing. (Even the sorting doesn't really help anything)
I need an OS which allows me to just place a program onto the SD card, and let the PI run it.
So a simple OS which does this:
Load very small program (something like arduino sketch)
Maybe even output some text to the screen...
Execute till power-off
And that's it..
All the OS'es I compared are for full fledged systems to browse the internet, watch movies, listen to music, all too hardcore for what I want to do.
Is the an "arduino OS" for raspberry pi or something like that?