Check out The RSS Wishlist at the RSS Weblog:

It may seem obvious to readers of this particular blog that just about anything on the web that changes, whether frequently or infrequently, should have an associated feed. Readers all over rejoice when a major publication decides to hop onboard the syndication freight train. And beyond your typical publications, there are hundreds of innovative services that are just waiting to be remixed with some RSS flavor.

So, what would you like to read with a feed?