There's a skip in the middle of the video. I accidentally hit the stop button on my keyboard. I probably shouldn't eat Trix while doing video tutorials.

By the way, I know the skinning's not perfect - I'm working on this rig right now.

Anyway, simple concept. Picked this one up a few years back:
You want to create an SDK for a left to right on a smile, and don't want to go through the nuisance of moving them all and positioning them just right.
Create a locator, estimate where it's pivot should be, parent constrain each control(or locator in my case) to the main locator, then move the main locator and SDK the lip locators for the -10 and 10 values. When you're done, delete the locator, it'll delete the constraints, and you're left with the SDK.

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