To launch VNC w/ GNOME put the following in your ~/.vnc/xstartup:

%%prettify 
{{{
!/bin/sh                                                                                                                                       

[ -x /etc/vnc/xstartup ] && exec /etc/vnc/xstartup
[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
$geometry = "1440x900"

xsetroot -solid grey
vncconfig -iconic &
xterm -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" &

unset SESSION_MANAGER
gnome-session &
}}}
/%

And then run (for mac resolution 1440x900 on port 5900):

%%prettify 
{{{
vncserver -geometry 1440x850 :2
}}}
/%

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[CategoryComputing.Linux]