Somehow, someway I missed the news about PubSub.com. It lets you subscribe to RSS feeds that match various subjects. For example, you can subscribe to a feed for the phrase "Movable Type". The feed is populated by matches against the weblog community (I'm not sure how broad their coverage is, but it includes my site, so it must be pretty complete). They also can create a feed that scans newsgroup posts. It provides close to realtime information. It can also introduce you to new news sources/web sites that you were never aware of before.
Also, this post was mentioned over at kwc. Within 7 minutes of that post, I saw it mentioned in my "Brad Choate" PubSub subscription and posted a comment about it. And since my RSS reader doesn't refresh every minute, I'm not sure exactly how long it took PubSub to find that post. But even at 7 minutes, that's pretty impressive.
Warning: Use of PubSub services could turn you into a newsjunkie if you aren't one already.