That keepit.com link works the same way. There's a few web sites out there that work the same way - free. They all download the file to your desktop, and some you will have to add .flv as an extension.
I'm a Mac guy, so I don't know the names for the PC version flash to MP4 converters, but they are out there as well. I'm surer someone can direct you to a couple links.
The best free flash player for Mac I've found, is Whimpy Flash Player, available at:
Basic, no bells or whistles, but doesn't crash like others I've tried.
To convert flash (.flv) to mp4. I use isquint, available for free at:
It's mainly for converting video for ipod, but there are settings that let you save the vid in a larger screen format. So far, I've found no clitches.