If this was the hardest exercise ... This was great! I've been hearing about RSS feeds for years(!) and never took the time to explore. I subscribed to some generally random things for this exercise: Dictionary.com Word of the Day, Quotes of the Day, Unshelved, KCLS27things, and some co-workers blogs.
I can see using RSS for so many things. When I sit down at my computer in the morning to check on all my regular websites, instead of browsing to each individual site, I'll be able to just go to Bloglines and view it all at once! For professional uses, it would be a great way to stay on top of emerging information. Wonderful! Everyone should be using RSS feeds!