I am thinking of developing a website that would use RSS feeds for
much of the content. I would like a list of 10 websites that use RSS
feeds extensively for displaying content. Subject matter of the content doesn't
matter (as long as it's in English) - I'm just trying to get ideas on
how the output could be displayed since I'm not tech savy.

Hi,

I can recommend you yourself (or asking a PRO) to take a look at one
of simple sites for example, http://www.viedesigns.com/ - vieSearch(c)
Live content network

In a couple of words, that engine was done by me and collectes
RSS/XML* formatted news from as many resources as you want. Currently
it fetches and reformats the content of about 6000 resources and get
them storeds in DB as a temp. built-in cache system to be viewing for
the day.. (or some hours of course..). The system also uses highly
customized SEO URL schemes that are btw 'still under construction'..
but it is getting nioce results grom uncle G ;)

Just in case you are interested, i'd recommend you take a look at how
everything is constructed there.. it is a complex engine (even if it
looks buggy a little), i am still working on that ;)

Hope this helps.