Lotus Connections v2 (which will be released in less than 2 weeks) adds some very nice capabilities to visualize usage metrics. These metrics are useful during a Pilot and/or Production phase of deployment.
During a pilot, it's important to see how much the servers are being used so that we can use that information when estimating a deployment architecture for production. It's also valuable to see how adoption is progressing. I, however, wouldn't rely strictly on usage reports to gauge the adoption within an enterprise. Instead, I think that's a task that the Atlas component for Lotus Connections can do much better!!
During production, it also helps to see how the system is utilized to help gauge whether it needs more capacity. Don't, however, rely strictly on these reports. You should definitely use better server reporting tools.
Anyway, I figured I would share with you some of the reporting capabilities that will be available in less than 2 weeks! Here's a preview of what you can expect:
Blogs: (updated 06/05/08 to add missing Blog screenshot)