Hi Lion,
thank you very much for all the effort that you have made to put together a .dmg for the MacOSX. I think that this is really a very good idea and it will easy up a lot the use of obspy to all those working under MacOSX.
This is to let you know that this morning I downloaded and installed it on my iMac at home running 10.6.8 (unfortunately I do not have any 10.5.X installation available) and it worked nicely for the little I played with (graphics using matplotlib using some simple script) and the test cases you provided - Thank you!
Best
Alberto