Hi,
I have recently published an android app that allows you to send popular newspapers and magazines directly to your kindle - using calibre as its backend.
It is still in beta, and I am working on a new version, but I think it is now stable enough to use and invite comment.
Also - I wanted to ask the calibre devs if they are happy with this - the app uses the GPL license so source code will be open (available on request and probably also published on github once I have cleaned it up)
Link to play store version is
here
Very grateful for comments, suggestions etc.
Jamie