Octagate Site Timer
I saw this little gem via digg. This is a great tool, the one thing that wasn't obvious to me, was that there were no details about the files listed. After contacting the author, he informed me that the "i" button beside the URL title would expand the table revealing other columns that show such things as: file size, start time, … If you click on the "i" button and don't see anything appear, try the horizontal scroll bar on your browser window.
http://www.octagate.com/service/SiteTimer/
It works well in IE, unfortunately I've had no luck with FireFox.