To date, most people have been using Valve's Source Filmmaker for comedic purposes, but let's remember, comedy is but one genre. So it's nice seeing this clip that's reminding us the tools can be used for more serious stuff as well.

This is amazing. The effects here rival those of all but the finest in professional pre-rendered trailers, so it's almost intimidating to think what people will be able to come up with when they really get a handle on the software.