A few months ago, I built a little prototype script that generated .ics files from .recently-used files generated by OpenOffice. Very frequently users know when they edited a document, but can't remember what they named it. The feedback was positive, so I made the script a bit more robust and submitted it to the cron for all of our employees. Some users were creating .recently-used.xbel files because they are making use of the GTK file picker, and the script was updated to take that into account as well. If you have a server and multiple users, the code is here . It's a bit hard coded for our environment, but should be a good start.
In the shot below, users are able to see the date and time that they touched files in OpenOffice; from within Evolution.