I work at Ithaca College, and we have a successful implementation of Geeklog running as our faculty and staff news service. However, we did too much bad customization in the past, and upgrades have been terrible.
So, I'm looking at this same question, or finding a supportable approach to replacing my hacked LDAP integration with something more along the lines of Geeklog's structure.
What conclusion did you come to?
Benjamin