It seems that some form of Google Earth Beta for the Mac is making its way around the ‘net. It doesn’t seem that Google has officially released it yet, but you can get it from this odd source and follow the clumsy link path while (likely) someone generates ad revenue from your clicking.
I’ve installed it, and it works, although I haven’t tested a lot of feature yet. It does require Mac OS X 10.4 (Tiger) or later. If you desire a more direct source to get this Beta, contact me.
I’m assuming that this is either a leaked version, or a Google-instigated leak (aka. viral marketing). However, I’m thinking that the latter is not really Google’s style.
Update: I went back to view the download source for this file, and saw the follow message:
What file? Google Mac for Earth? Whatever. I’ve never heard of such a thing.