Pirates at home is the development platform and site for Einstein@Home. They are currently testing a Mac Installer for BOINC. It is really just an apple script, but a nice one. While it defaults to setting up for Pirates@home, it could be used with any BOINC project.
If you want to check it out, go
here to download the client labled BOINC 4.38 (the client version is BOINC 4.16 actually)
If you are signed up for Pirates, you can provide feedback in
the Pirates Forum. Incidentally they are also testing a new forum format that will be used for Einstein, when they go public.
If you don't have access to the pirates forum, feel free to post any feedback here and I'll pass on any comments.