the Walker's blogs are run using an opensource software called Wordpress. These are a few of the links I found most helpful for beginning bloggers.
Introduction to Blogging:
http://codex.wordpress.org/Introduction_to_Blogging
Writing Posts:
http://codex.wordpress.org/Writing_Posts
About blogging:
Although this page is about academics blogging I think it has a number of relevent ideas for our new bloggers to consider.
http://cyberlibris.typepad.com/blog/2004/11/academic_bloggi.html
More about Blogging as a teaching tool:
http://careo.elearning.ubc.ca/weblogs/brian/archives/012549.html