While you might expect news and search sites to offer RSS feeds, there's other content that is quite suitable for RSS as well. For example, if you'd like to monitor new, published patent applications, try FreshPatents.com where you can grab a feed for all new applications by industry, inventor, location or agents. You can also sign-up for a weekly email alert with new applications that match the keywords you select.
It just goes to show that just about any site that publishes new information on a regular basis could use RSS feeds to keep readers/researchers coming back.
[Spotted on RSS in Government]