SSH remote using XQuartz dosent work in Lion
As per this page, X11/XQuartz is deprecated from OS X now, and you will need to install it seperately in order to get any X-Windows display manager type stuff working:

http://support.apple.com/kb/HT5293

There seems to be another X11 download here which may also be useful.

http://support.apple.com/downloads/X11_for_Mac_OS_X_1_0