Zune HD development limitations

I'm wondering if I can write something like reading app (to turn my Zune HD into the Amazon Reader)Can I write applications?How am I limited with API? Can I use network and FS? Can I embed a browser to the app? Can I use XML parser, XSL, etc? Are something like Windows Forms there?How am I limited with development, do I need to do some terrible things which are needed to develop for iPod?...Read more