Edit: I do know that "Square" isn't an official release, it's a preview, but boy is it great. 64-bit support on Linux, hooray! 32-bit with nspluginwrapper is a pile of crap and would consistently crash, also taking out Firefox before they abstracted out the plugins from the browser. Secondly given Flash Player is insecure by default, it's probably better to be using the bleeding edge release over the current stable since it's less likely to be targeted.