As noted by follerec in reply to O5220803, this was an oversight by the developer. You also need the SDL_mixer.framework, available from http://www.libsdl.org/projects/SDL_mixer/
Give him a chance: a) this is free, b) when no-one else would port the project to Mac, he did. Version 0.8.1 will be out soon, so hold your horses.
Note that the config file has changed its location slightly from the previous version. Version 0.7.1 stored it in ~/Library/Preferences/stellarium.ini, whereas 0.8.0 stores it in ~/Library/Preferences/stellarium/config.ini
[Version 0.8]
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Stellarium
Give him a chance: a) this is free, b) when no-one else would port the project to Mac, he did. Version 0.8.1 will be out soon, so hold your horses.
Note that the config file has changed its location slightly from the previous version. Version 0.7.1 stored it in ~/Library/Preferences/stellarium.ini, whereas 0.8.0 stores it in ~/Library/Preferences/stellarium/config.ini