Is the feed an irreducible element of the blog? Wesley Fryer thinks so:
A website without an RSS or ATOM feed … is not a blog! You can call it a blog by putting that title at the top, you can even update it every day, but if it doesn’t have a feed it’s not a blog!
My feeling in not finding an RSS feed is really more one of regret, since that means I can’t “pull” their information into my RSS aggregator (bloglines) to access their content more easily.
I think we can stipulate that the presence of a feed makes life easier for a growing number of readers, and since most blog software now includes templates for RSS and/or Atom feeds, I presume that the majority of blogs have a feed of some sort even if the blogger has absolutely no idea about such things.
Then again, who doesn’t have a feed? Mr Fryer mentions Media Literacy: Frank’s Blog. Lileks doesn’t have one; neither does Colby Cosh. Rocksnobs, which doesn’t look like a blog, doesn’t have one either. But that’s all I can think of without going down through the entire blogroll.