I have had a blogger blog for some time now.  I think it is one of the best services I have used.  Of course it is owned and run by Google, so you would expect it to be pretty good.

Whilst the blog system doesn't have that many features, when compared to something like WordPress, the system in general is good and has a lot of features and addons supplied by other people.

It is not database driven like systems such as WordPress or Drupal.  Instead it used plain old flat files, which makes it mega quick.

It's a joy to use and I'd recommend it to anyone looking for an online blog.