I use Blogger for this blog and a bunch of others.
I like it because of the simple user interface, and the dashboard allowing me to manage multiple blogs from one login.
In the past, Blogger was more of a trend follower than a trendsetter, however in 2010 we've seen a bunch of improvements including a far greater selection of templates.
I just watched this video from 2011 SXSW conference, and it looks like they have a new user interface that should finally make it competitive with WordPress for professional blogging.
Blogger Buzz: What’s New With Blogger