iPhone SDK Tutorial: Build a Simple RSS reader for the iPhone - TheAppleBlog
Once you signup and download the SDK you can use this tutorial to point you in the right direction of building your very own iPhone/iPod Touch Applications.
Rockbox Alternative Portable Media Player OS
Yes it does install on iPod and yes it does allow said iPod to play OGG files. I used to have this on my Archos Jukebox and loved it, I am glad to see it has expanded to pretty much every other major portable music player.
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