Hi!
My favorite site for freediving videos is:
http://www.chez.com/defaut/apnee/realvideo.html
They have about 15 videos, mostly from TV documentaries. In addition to record attempts you will also find something on physiology.
I also like
http://www.freediving.at
They have a video of a constant-weight-lake record.
Direct access to this video should be possible via:
http://212.236.10.3/tauchen56plus.wmv
The quality of the videos is not always good. So maybe you go and see "Oceanmen" afterwards... (No, they don't pay me...)
Cheers,
Uli