We recently bought the Sonoris DDP player as well, works nicely on a snow leopard mac pro.
So now we've several apps that can create/read/play DDP on a Mac:
Sonic Studio sB, PMCD, & DDP player.
WaveLab 7
Sonoris
AE Backline
& WaveBurner 1.6.1 which will create, but not read.
At some point we intend to compare the contents of each type of DDP folder, given a little free time : - )
JT