If there ever was a sector that could provide its customers with the biggest benefit by using RSS -- it's government.
Daniel Terdiman's post RSS Edges Into the Bureaucracy for WIRED in November of 2004, was a preamble to the possibilities.

Guy Kawasaki points out FeedHub as great concept going for those people tracking a lot of feeds.
The comments and feedback on the post are that people don't trust the system, the filtering will eliminate something they might have been interested in, someone now has data on your personal surfing habits, etc.
I've signed up for the service and will see what happens, before I post my concerns.
Adam Pash at Lifehacker has a great post, Become an Online Power-Shopper.
Read it because it will save you money. I've been using the RetailMeNot.com Firefox toolbar application when purchasing online. Not only is it a brilliant money saver, but a big time time saver.
My observation from Adam's post is how he is using the RSS feeds from Newegg.com, Techdeals.net and FatWallet to stay on top of what is hot, discounted, new.