I get asked quite often about blogging and how one begins their own blog. The answer is very simple and I direct everyone to the same site: Blogger.com, that is unless they are talking about something more serious and need a their own server and such. Blogger is simple to use, I mean very simple to use. I can have a blog up and running in about a minute. Additionally, its free. Another great thing, its owned by google. This means it integrates well with youtube (also owned by google) and gmail, google calendar, etc. I have all my pre-service teachers learn how to create a class website using this tool. I find they think its one of the best technologies I teach them because its so easy and useful.
Here is the link to get started: http://www.blogger.com