You are really having to ask this? Shouldn't YOU be giving the rest of US a seminar on the obscure aspects of the thing?
One of my favorite uses for my Kindle is as an aggregator of long-form journalism. You set up an account at Instapaper, link it with your Kindle and then anytime you see something long online that you want to read later, you click "read later". Then, every week or so (you actually can determine the interval) Instapaper sends all of you "read later" articles to your Kindle in the form of a single ebook in which each article is a "chapter".
It's great because it's so fast and easy. It also only costs you 15 cents per ebook. Lastly, you can manage all of this digital content by accessing your Amazon account.
I believe you can read blogs and the like, but I never do anything on mine that requires internet (except for downloading books).