It appears this freq is used on a regular basis. I have logged activity each day since this post. The other day one of the aircraft mentioned 3443 kHz, which is another Test Flight freq according to the Aerolist.
This afternoon a Boeing 787-8 Dreamliner (Boeing 004, N7874) was up on this frequency.
Also heard a B737 for China Eastern and a B738 being delivered to Virgin Blue.
Good blog to follow activity: http://boeing-test-flights.blogspot.com/