How about drawing a line with a cloth tape or a chalk line and with the camera overhead to show swerve?
LAMas, great idea. I got some great footage using a piece of masking tape to mark the center line. I shot all shots with center-right (3:00) spin, and tried my best to keep my cue parallel and in line with the edge of the tape. This equates into about one tip of English. I shot shots with varying speed so we can see how that affects the path. I got footage of my Z2 and my house cue. You can really see the difference, not only in the cue ball path, but in the residual vibration of the shaft after contact.
I'll put together several of the suggested shots in this thread and put up a link this weekend.
-Blake