Adam and Sandwich video are pretty much the reference in the "startup videos" industry, specially for "live action" videos. They have such a distinctive style and premium quality standard attached to each of their videos. Even though they have a very specific style, they always try to stay innovative and craft original concepts, which is very inspiring. We made a "behind the scene" interview with Adam a little while back when Sandwich really started to get popular http://startup-videos.com/blog/startup-videos-interview-sand... definitely worth a read if you want to learn more about his process.

That being said, there's a lot of other very innovating and smart videos made by other studios/startups, and if you're curious about them, a good place to check out is http://startup-videos.com (disclaimer: I'm one of the cofounder of the site).