Brent, this is my single most favorite (grammar?) feature in NNW now:

HTML differences
I’m going to be writing about new NetNewsWire features for the next few days… Here’s another one: HTML differences.

I read this later in the same post:

That leads to a little advice for app developers—your users are smart. The list of features I didn’t think I’d like, but that I did anyway because people asked for, is pretty much the list of cool features in NetNewsWire. (Groups, for one thing. The Combined View is another big one. And so on.) [inessential.com]

Thanks for including this comment, Brent. It's one of the reasons I was thrilled to send you the money for the “pro” license for NNW. You write for and listen to your users. NNW is the only app that I want to use to read aggreagated RSS feeds.