Thanks mj, I tested this Processing 2.0b8 and OSX 10.7.5 and it works only in 32 bit mode (which you can set in the Processing preferences screen).
Setting it in 64 bit mode will give you the "wrong architecture" error: library/libJMyron.jnilib: mach-o, but wrong architecture
I've send a mail to the person who made the Intel compile to ask if he can compile a 64 bit version as well. If someone else know how to do that, please feel free.
One other problem. In JMyron you cannot select your camera. Since I work on a Macbook with build in FaceTime camera, that one is picked.
The only solution is to start up Photobooth or something that uses your build in cam, so JMyron will pick the other free camera available (a work around that I've to use in Flash a lot of times as well).
Of course it would be nice if the native Processing library could support Quicktime camera's as well (but probably this is not really beneficial, that's why they probably dropped it).