Generally, you'd agree, every website has an "about" page that describes it. It's important, and noone can deny this. People at "A list apart" even wrote something about it.
I confess, I'm a little bit lazy when it comes to writing. First, because English, as much of you know by now, is my 4th learned language and sometimes it's hard for me to express myself in it. Really. Second, I told to myself that FriendFeed is by itself self-explanatory and I should invest more time in fixing bugs and developing the thing more than talking about it... I know I'm wrong :)
Anyway, I'd like simply to say that Louis Gray has written a great blog post about NoiseRiver that really should be read as the "about page" of NoiseRiver. He explained, maybe better than I could have, all the details and features that NoiseRiver has to offer. So if you still wonder what NoiseRiver is about, I really recommand reading Louis Gray blog —which, by the way, is one of my favorite blogs: simple, detailed, true and not "hypy and buzzy just for the buzz of it" —I'll explain this someday, maybe :)