Over the weekend I wrote a small web app that takes an RSS feed for a blog, grabs the feed, cleans up the HTML, strips out small irrelevant images and compiles them into an e-book with chapter anchors. It requires a Google login since it uses the Google Reader "API".
As an example, I was going on a long vacation and had recently discovered Paul Buchheit's blog. I used this tool (which was then just a Python script) to create an e-book and I literally read his blog "cover to cover".
It's still rough around the edges, but I figured I'd iron those out if at least one other person thinks they would use this.
For those interested, the hardest part of this project, surprisingly, was getting Google's OpenID+OAuth hybrid login working since I couldn't find any libraries that had it built in.
http://blog2kindle.com/