I'm not a registered member of hd.vidz.com, so I can only download sample videos from this site. They use HTTP protocol, so you can download or capture them with freeware Fast Video Download, Freecorder 4, commercial Replay Media Catcher, WM Recorder as well as many other programs.

See also:
FAQ: How to record/download/capture/save Adobe Flash .FLV video HTTP stream from embedded player