That's great that they're doing that now, and especially nice that they haven't turned it into a profit center (yet) like so many other companies have with their certification programs.
Hopefully they'll start a similar program for FreeSWITCH although it's a somewhat different business model. Digium supports Asterisk in order to sell hardware cards, etc. while the FS project is tied-in with the Barracuda CudaTel, a complete FS-based telephone appliance.