RTC compare change sets
One answer
If you are using the RTC Eclipse client, you can compare the workspace and stream, which will open up the Change Explorer view. You can then use the view menu (down arrow icon at the top right on the menu bar for the Change Explorer view) and select Generate Change Log...
From there you can specify the amount of details you want, and then save the result in a file (this can include the work items / change sets / files, etc.)