A Rich Site Summary, wonderful for easily staying informed about the updated content in the sites I'm interested in. Sounds good, so I set up a RSS feed on Google Reader - I see all those orange icon thingo's with the white arches that remind me of visual sound all the time, so I figure this will be easy - I begin embedding all my favourite sites - hmmm "no feeds detected" "no feeds detected" "no feeds detected" - ahhhh none of the sites I regularly visit have the little orange icon thingo. Need to find me some of those.
Done...however I'm not keen on the whole subscribing idea. I actually find myself getting extremely annoyed when I get sent an email, with some sort of newsletter from a website that I possibly, accidently visited once, and then need to unsubscribe by trying to find a tiny little link at the bottom of the page which then requires me to send a return email.
So I find myself asking, why would I want a whole website dedicated to annoying web feeds?
But then I think more like a 21st century learner and realise, that it's actually a great tool for saving time because I don't need to visit each site individually. I can also now see that my privacy is ensured by not being obligated to join each site's email newsletter.
So I would definitely use this in an educational context for the above reasons, but as for all my other favourite sites...

I love how my Mac homepage directly comes up with twelve of my most recently visited web pages, along with a folded down little star
to indicate any new information.