RealPlayer
Trying to keep up with the football this afternoon showed up a little problem listening to RealPlayer streams on the Intel version of OS X.
Bottom line is that RealPlayer is not yet a universal binary. So although it runs fine stand alone it doesn’t support being embedded in a universal binary.
i.e. because Safari and Firefox 1.5.0.2 are in universal format, they cannot embed plugins that are not.
So the options are :