Doug Marcaida demonstrating possibilities with the karambit - impact striking to dynamic deployment of the blade. We're big fans of the k-bit in various forms and Marcaida is one of the best edged weapons dudes in the world...good stuff.
Maintaining situational awareness and elevator tactics from Tony Blauer. Good one to watch - elevators are a common site for criminal attacks.
NRA's Media Lab with Dom Raso has been some fun viewing. Dom takes scenes from action movies and does the whole Mythbusters - 'would this work' deal. For the record on this specific episode - plausible. Jerry Miculek could do it.
Speaking of Jerry, this is one I've been wanting to share for a while. Jerry quick scopes a friggin' grape faster than most people can clear their holster.