Google Earth works fine on TC 2.x with some limitation.
It requires accelerated graphics, you need Xorg by default. Due to some reason, it doesn't work with certain Intel chips e.g. GM965, you get an error message but works with ATI.
Due to license restrictions it can't be redistributed as a .tcz extension
However it is worth to try on TC. Send me a PM if you need help. Maybe a script to convert your downloaded personal copy to .tcz would help to integrate to your TC installation.