When we shoot a mocap session, we log shot information into an openOffice spreadshee as we record each scene. Since Recorder automatically generates a filename with a timestamp, I just copy and paste this into the spreadsheet and enter a very brief description of of the motion. I also enter character name and the shot number for which the motion is intended. This document is then used for reference during tracking and editing, and final scene assembly.
Even better would be a database program specifically designed for this task. I haven't bothered to make one because our motions are project/scene specific and not really meant for future reuse, but creating a mocap database for this sort of thing isn't difficult.
For previewing mocap files, another user turned me onto this free program:
BVHViewerThe nice thing about this previewer is that it allows you to quickly browse a directory of files with an animated preview of the motions, without having to actually open the file.
I know this isn't exactly what you're looking for but maybe it will help get something going for now.
G.