I just finished the first version of
Bibliorize. It lets you list a set of web pages and then download them straight to the kindle.
If you're familiar with html2mobi, it's like that, but without requiring you to connect your kindle to a computer. In that respect it's similar to emailing
USER@kindle.com, but it doesn't fail as mysteriously (at least for me).
Please take a look. I'm sure it has problems, as it's tough to figure out what HTML the kindle will accept. It works for the pages I've wanted to read so far, though. It might be a few days before I can work on it again, but I wanted to get it out there for comments.