I picked up a copy of The Best Software Writing I: Selected and Introduced by Joel Spolsky. It's essentially just a collection of Joel's favorite blog entries from the last few years. But it's Joel, so you know they're going to be good ones. In the introduction, he explains why he's so enthusiastic about blog writing: it encourages the simple, but powerful use of show, don't tell:
This is a companion discussion topic for the original blog entry at: http://www.codinghorror.com/blog/2005/07/show-dont-tell.html