q2kindle is a free web app that sends articles to your Kindle as a single, formatted ebook. Paste URLs into your queue (or use the chrome extension), pick a delivery schedule, and your Kindle gets a new issue automatically. Each issue comes with a cover page, table of contents, volume and issue number, date, and total reading time. Send to Kindle only sends one article at a time. Instapaper buries this feature in settings and puts it behind a paywall.