Caroline I was so happy to see your post since we are planning to roll out our instance of Jive to our Channel Partners and Global System Integrators. We don't have any experience with it yet, but I hope to see others post and reply in this Community in the future.
I will monitor and post as we proceed in this area.
Hi Caroline - I manage Protect 724 and am glad you found the customization to be of interest! We definitely felt it was important to display some content on the home page, rather than just the login screen only, in order to promote the community. If you have any questions about the customization, please let me know!
I think another example is the StrongMail Spark community: http://spark.strongmail.com/login.jspa