This morning one enterprising developer hit upon the best way to get me to look at his new service; he followed me on Twitter.
ReadBeam is a rather nice web based blog conversion service. It only supports converting from a limited number of blogs, and it only offers Epub and Kindle. But it also does a nice job and it's fast, too.
I created an account and requested Ars Technica. It arrived within minutes, and it still have the default cailbre cover. Not a problem; I actually expected that ReadBeam would use calibre. Though I have to say that I'm surprised by the formatting. The articles have a menu included in the heading with links to next/previous article, main menu, and section menu. I didn't know the automated conversion in calibre had gotten that sophisticated.
There are a bunchaton of services like this now, and this is definitely one worth checking out.