We already produce ePub and Kindle mobipocket files in our Push to Kindle service. You can try it out here http://fivefilters.org/kindle-it/

1. Enter a URL (we also have browser extensions)

2. Click 'Preview'

3. Select the No Kindle? tab and choose 'EPUB'

I use Mozilla Pocket to do essentially just that. I add articles to Pocket with Firefox Desktop and then read them on my Kobo e-reader. I find it much more pleasant to read long articles a page at a time instead of scrolling.