why blog?
Neil Gaiman answers the question, "Why do you keep an online journal?" and I like his answer. Admittedly, he's someone who writes for a living anyway so he's got different motives to your average livejournal user in, I think, a lot of respects, but I certainly identify with him talking about searching his own site to find out when he was last (his example) in Finland - I've found myself going back over both livejournal and my own site time and again rereading what I wrote and recalling the circumstances.