Diego Doval: An Introduction to Weblogs.
Excellent resource for anyone wanting to know what they’re about and why anyone would bother!
I particularly like this quote:
“My opinion is that some people are more attuned to the concept than others, because they are already sort of weblogging even if they don’t describe it as such. For example, if you like to rant about anything, if you keep pestering your friends, family and coworkers about different things that you’ve seen or read or thought about, or if you regularly launch into diatribes about all and any kinds of topics (e.g. “The emerging threat to African Anthills and their effect on the landscape”) then you might be a Natural Born Blogger. :-)”