We're using digital badges as an option for teachers to demonstrate their knowledge while providing for a flexible learning environment.

In our district, we've done training on blended learning, competency-based education, and student demonstrations of mastery, but had not been able to convince professional developers of the importance of providing these options for teachers as well.

Initially, we started with discussing the concept of digital badges, with teachers enthusiastically (after they got going) seeking to complete our "test" badge.  Since this proof of concept, we've started to convert some of our "sit and get" sessions into self-paced (and still compensated) professional development options.  We launch district-wide in a few weeks, and so far, the response has been amazing!