I know you’ve had some issues with the Mac side of things, so I’ve been investigating an alternative solution, despite the fact that my knowledge and ability in this area was close to zero last week. However, due to the wonders of modern technology assisted learning (lots of googling, mainly), I’ve managed to half-make a Mac OpenSim standalone application, and I’ve got a sense that it would be possible for someone cleverer than me to make one that works. The idea is to create an application package which sneakily hides a Cocoa based OpenSim launcher application and a pre-configured OpenSim binary inside something that looks and acts like a single application. I also think, based on this link:
http://code.google.com/p/cocoa-sharp-dev/wiki/RedistributableAppWithoutInstallingMono
that there might be a way to bundle a runtime of Mono so that the end user won’t have to install it. As X11 is pre-installed on Mac OS 10.5, the end user would just need to download a single app and launch it for a lovely OpenSim standalone experience.
As I said, I’m slightly out of my comfort zone here, so all of this may well be impossible.