Video clip capture?

[Doctor Gallop]

Hello peoples!
Does anyone have an opinion on how to capture an online video clip? Is there a freeware program I could use?
I watch a lot of horse races from web sites and I was wondering how I could somehow download them and save them.
Thanks in advance.

Doctor Gallop

 

[Mictlantecuhtli]

See the replies from year 2006 in Nvidia Dawn (fairy) demo on ATI cards.