Charlene Li of Forrester Research is looking into RSS usage that is not blog related and she’s looking for some examples.
Just out today is the Amazon beta Dealazon. Very cool. Delta Vacations also has a feed but it's impossible to find - looks like they've done some site maintenance and the link got lost – I subscribed to it out of curiosity but since Delta’s all but pulled out of the DFW market, I’ll probably dump in favor of the Continental feed.
If you have any examples, I’m sure Charlene would like to hear from you.