Lots of great comments here!
At Gavin's suggestion I just now posted two sets of pictures, those of the first mouse caught and the sixth mouse caught. Warning -- the images are graphic; please don't view them if it bothers you to see a mouse killed!
I didn't take the time to create the HTML to view it as a movie, so you have to single-step through it. If you're so inclined, you can always save the images locally, and then view them with the MouseCam program.
I didn't bother with mouse2 (which was only a single image, since when I caught it, I'd inadvertently set the maximum save to 7200 images (ie. 2 hours' worth), and thus didn't have any "live" shots of the mouse, if you'll forgive the pun). I also have the "mouse4" sequence, which is fairly short; that mouse wasn't as careful as "mouse6" is, as I mentioned in the OP.
shmem, you're right, I was interested in "how" they were stealing the traps (which I never did find out). Someday, I may have more evidence, if the traps ever appear ...
zentara, I'll take a look at your program. I did think of using motion-detection, but I didn't have the time to try writing the algorithms, as I wanted to start catching mice as soon as I could. (I also didn't mind saving all images, since it guaranteed I wouldn't miss any, and my "purge" algorithm worked fine anyway). As for a light source, I had a lamp continually on in the basement, so the image would always have some light during nighttime hours.
And kyle, you may be right, but fortunately I'm not squeamish about disposing of the mice (although my wife is a different story). I've gotten lots of good information from people, and found that the common wisdom is correct -- the mice are the most happy with good ol' peanut butter. I've also heard (though not tried it yet), that they enjoy a fatty piece of bacon.