I just learned about this site and am already obsessed. PDF My URL does exactly what it sounds like: it creates a PDF of any URL you enter into the site. After typing the address of the site you want to PDF, you're immediately prompted to download the document, which defaults to be saved the on your computer wherever other downloaded files are saved. It automatically creates pages based on the length of the site, and advanced options allow you to change the page's orientation, add headers, and more.
This is a great way to send online content via email — especially if it's a site that changes frequently. Plus, there's a bookmarklet that you can drag into your bookmarks folder or directly onto your browser; just click it to PDF the current page.