Google Reader -- my personal preference in RSS readers -- now allows you to place the URL of any webpage, RSS be damned, into its "Add a subscription" box and track updates made on that page. Mashable says this might be particularly helpful for keeping track of updates to a homepage. The Google Operating System blog also offers a neat trick for generating a URL of the page feed created by Google.
This comes on the heels of Sidewiki, Google's Toolbar plugin that socially enables any webpage. (I blogged about it earlier.) It seems like Google is trying to break out of the RSS/social media boxes and give the web legs, which is really intriguing. I wonder if people will use this functionality to "spy" on webpages that aren't designed as publications. How subtle a degree of update can it detect? Will any spoilers be found via Google Reader custom feeds? Like maybe about a certain tablet? :-)