Here's a tool I'd really love to have (and I can think of quite some people who'd also like it).
A program like "SWF Cache Viewer" (http://www.browsertools.net/SWF-Opener/index.html) but for movie files (avi, wmv, mov, mpeg, mpg)... sorted after day/date.
Usage: I visit some site with funny videos and clips and see something I like. Instead of browsing to Temporay Internet Files, search the file, copy it to clipboard, get bugged by Windows about some security issue, go to some other folder, paste... I'd just use "Movie Cache Viewer".