Nicely written introduction to weblogs by Diego Duval:
Introduction to Weblogs Part Two: Syndication
This two part tutorial has been pointed to by several people already. The reason I point to it is because I want to be able to come back to it quickly and permanently. I want other people I get started on blogging to read this introduction. By pointing to the intro in my blog, I make that referring very easy. Another good reason to blog things. My blog is a permanent record of things I want to refer to at a later date.