Played around with this today after
seeing it on Lifehacker, and it looks sweet. It's a new web app by Readability (you don't need an account) that lets you drop in links, then stitches them all together into an ebook with the ads and such stripped out. You can download or email an EPUB of the results, or send it straight to a Kindle or iOS device.
You'll see on the front page that it also shows you lists that other people have put together, so it can be fun to browse and explore, too.
Readlists.