Sometimes the best ideas are the simplest ones
One of my favorite digital series (branded or otherwise) is Undercover, a musical performance show from the AV Club and Starbucks. They've been doing it for a few years - and it's great content. More to the point, it's an extremely simple idea. Have bands traveling through Chicago come into the AV Club's office and cover a song. It looks great, sounds great - and is probably super cheap to produce. This is the latest video featuring the Punch Brothers covering the Cars. Totally fantastic example of digital content done right.