I found more Blogs sites at JHU, and three of them are powered by TypePad.

http://www.typepad.com/

Hopkins Insider: Your behind-the-scenes access to the Johns Hopkins Admissions Office

Hopkins Interactive Guest Blog: A different Johns Hopkins student featured each week

The JHU Fun Blog: A weekly look at how we have fun at Johns Hopkins

This Week@Hopkins: A look at what’s going on around campus and around town

The Sheridan Libraries Blog is Powered by WordPress with Pool theme design by Borja Fernandez.

http://blogs.library.jhu.edu/wordpress/

Welch is looking for a good Blog software/tools that can be used

with WelchWeb or MyWelch in the future.

Here is a nice  comparison chart of Blog software:
http://www.ojr.org/ojr/images/blog_software_comparison.cfm