What FOSS video editing software do you use, and how do you use it?

I'm interested on why you chose one over the other, if you tested a lot of them, and ultimately what do you use it for. And no, I'm not running a covert poll to develop a product, I'm genuinely interested.

I don't use video software right now, but as a FOSS audio guy, I want to keep an open mind about media creation altogether in the free/libre software world.