We have had some luck using Microsoft Site Server Analysis reports to gather information on what our Crystal Enterprise users are viewing. I can't tell which specific reports have been opened, but I know by directory. From what I can tell, the ActiveX Viewer file, viewrpt.cwr, logs a request everytime it is opened or refreshed. Of course you do have to set up the log files to track this information.
I have also thought about setting something up similar to what Roughing IT suggested...trapping logon information and storing it in a database.
Good luck,
Kent
kwarner
tdcs2000@davesworld.net