I came across the following two items in the CIT Infobits newsletter – useful both in terms of comparison, but also in terms of the list of features to consider when choosing blog software. (Thanks to Carolyn Koltas)

1 – Blogging services feature comparison
“Using a blogging service generally doesn’t require any software other
than a web browser. Users have no administrative control over the
software itself, but have some control over a blog’s organization and
appearance. Depending on the particular service, blogs can be hosted
either on the service??s servers or on the server of one??s choice (e.g.,
http://www.unc.edu). Users purchasing a paid account with a service typically
will have no banner ads on their blogs, more features at their
disposal, and better customer support from the service.”
Check out the
Blogging Services Feature Comparison chart.

2 – Blogging Applications Comparison“Downloadable blogging applications require the user to have access to
server space (e.g., http://www.unc.edu). Most of these applications are
comprised of CGI scripts that must be installed and configured in a
user??s cgi-bin folder. Although they are packaged with detailed
instructions, applications can be difficult to install, prohibitively
so for the novice. Blogging applications afford users fine-grained
control over their blogs, and most applications are open-source or
freeware.”
Check out the Blogging applications comparison chart online