Different bloggers, different reasons. I see this weblog as
1. An on-line notebook: a place to preserve and organize quotations from and notes on my reading.
2. An on-line journal: a daily record of the twists and turns of my intellectual life, along with some other sides of my life. A celebration of the life of the mind, an exemplification of the philosophical life. A record of one man's quotidian grappling with the world and its riddles.
3. A didactic site: a place where a serious and resolute reader can learn some philosophy for free.
4. A research site: a venue for trying out ideas and refining them in the teeth of critical comments.
5. An exercise in learning how to write better.
6. An experiment in what blogging might be good for.
7. A soapbox from which to deliver my commentary on the passing scene and do my bit to improve the world, one blog post at a time.
8. An open-ended project some of the purposes of which have yet to emerge.