Was recommended The KMPlayer
http://www.kmplayer.com/forums/index.php? at the weekend. Not had a chance to fully trial it, but it plays most stuff and you can pause (Space Bar) and frame-by-frame (F) and does frame captures. It's free and prettier than VDub as well as a bit more user-friendly (though VDub has functions it doesn't). You could tart up the stills in a photo program.
Unfortunately, a lot depends on the quality of the original footage - unless you work in one of the "CSI" labs, when you would be able to make out stubble at 50m from a picture taken with a Polaroid.