I thought there was a request for this already, but I couldn't find it.

When you publish a workflow, specifically a new version of a workflow, it would be nice if Workflow prompted you with a comment field where the publisher could enter a note. I personally would use this as a way to make comments about what I have just changed in the workflow. The comment should also be made available in the Workflow Admin Console when viewing versions of workflows there.

A new report from the \Workflows\Workflow Definitions area of the Workflow Admin Console would be great. When run, it would show you the various workflows, all their versions, published date & time, as well as comments.