raph: That's not even the beginning of it (as long as you're not too attached to "reverse chronological"). Some use it to write random rants about thoughts, others use it for purposes as varied as recommending commercial products to ranting about free software, while, and this has been a recent discovery for me, still others use it to create interactive fan-fiction. Of course, the non-personal blogs also vary: from free software, through geek community and ending in elitistic discussion sites, they cover all areas. However, you nailed one fact very accurately, and I thought it might bear repeating: Blogs are inherently webby: they are fun and useful because the web has, for all its limitations one advantage: however many links one puts, it does not disturb the stream of reading. Like in a certain horrible movie, they sit quietly, blued, asking us if we "want to find out more". They allow us to say what we mean by words like free without needing to launch the user into an argument he already knows. It even lets us inform the user how we feel about technical issues, such as threads without reiterating age-old arguments. Blogs fit the web naturally: the sponteneously create links. Google uses the web as an intelligent network of links. Thus, Blogs enhance the web in a way that Google is uniquely equipped to use to its fullest.
Like I said, I'm not saying anything that raph did not, but I hope I put an interesting enough twist on it :)