RSS to PDF Conversion
The aptly named rss2pdf site does exactly what the name implies, taking in an RSS feed and returning a PDF document as a result. I took the RSS feed for this blog and ran it through the site; you can see the results here.
Now all we need is an interesting way to use this! For example, taking an entire OPML list of RSS feeds and printing each one would create a rough sort of newspaper.
What are your ideas?