Name of Blog Software or Service:
WordPress 3.1Cost of Services or Software:
Still FreeMy Review
What I like about WordPress is you can use it almost "out of the box" choosing from a variety of free templates. Just enter blog posts change your blog title and you are pretty much good to go.
But for those who like to tinker, WordPress is pretty intuitive and fairly easy to change the functionality of by using different plug ins and widgets -- all without programming.
But.... for those of us who really like to hack code WordPress is a lot of fun because you can use this "blog" software as a very powerful content management system to drive some really impressive websites.
Skill Level Required
Beginner to advanced - depending upon how much you want to customize the look, feel, and features.

