Blogger is the free blog hosting service owned by Google. Blogs on Blogger are commonly known as Blogspot or Blogger blogs.

Features

• cost - none
• allows reader comments
• ability to delete comments
• allows multiple writers
• hosts photos
• allows you to post from your cell phone

Official Blogger Website

Blogger Help FAQ

Blogger Buzz Blog

Line-by-line Breakdown of Blogger's new Template Code

Blogger Topics:

Resetting Auto Discovery to Feedburner for Blogger Blogs

This will direct users who visit your site with an XML feed to your Feedburner feed.

Adding a Picture Banner to your Blogspot blog

This website has any number of other useful tricks for bloggers.

Add Link Building links to your Blogger posts

I tried this and didn't like the look/utility...but YMMV. Currently researching this possiblity

Adding Title Page code to your blog posts in Blogger

Useful article by Wayne Hurlbert.