I don't really use the one I have on my myspace much but sometimes I do...however I update my Livejournal semifrequently: http://www.livejournal.com/users/viciousbunnies
I also have Xanga but it gets updated like once a year cause I have no friends haha
I've often thought about starting a blog, but I'm not sure anyone would visit it. Besides, I'm not even that enthused with my life, why would anyone else want to read about it? hehe
I'm not going to flatter myself and assume that someone else would want to read an in-depth commentary by yours truly. I think opinions should be kept short enough for forums. If they are any longer than that, you had better be an accredited official on the subject your blogging about. If the blog is just about your life - trust me, no one cares.
I'm a natural writer and am damn long-winded, so of course I have a blog. A Livejournal one, and I rarely talk about things that matter. I mostly just bitch about my life or do random, in-depth commentary on TV shows or whatever.
I used to use mine because I was always doing something fun, I was going to parties including up to 4 shows a week and always had something interesting to say and took lots of photos. I used to get a lot of comments, especially since it was public. Now my life is humdrum because I've grown out of the partying and drinking with bands etc etc and I only type when I'm bored and have anything to say that anyone might care about.