CS2: Download reports for your File Gallery
I believe that the File Galleries that came as a feature built-in in CS 2.0 was a great feature. Now I can offer download area for my users a little bit like download.com. I can also see how many users have downloaded the files, and how many has read it's description. Users can also comment on the file entry as they can for a blog post.
But as with many things currently in CS there's more "under the hood". The feature I am talking about I haven't found in any docs, and I haven't stumbled on it until about a week ago. I am talking about Download Reports for your File Gallery. Besides seeing the number of downloads for a file, you can also see who downloaded it and when. Just go to Control Panel - My Files - Manage Content - Files (for the File Gallery of your choice). If you look at the right of each File entry you should see this:

Press the Download(s) Report button, and you get to choose a date interval, and generate a report.

Click on the image to view a larger version
As you can see, you can also export the report to Excel for archiving or additional calculations.