download the latest version of the spca5xx driver http://mxhaard.free.fr
extract the file with the archiver tool or on command line.
Then cd into the director in a terminal and type.
export CC=gcc-3.4 make sudo make install sudo modprobe spca5xx
then fire up gnomemeeting and you should be able to get video through by configuring your camera in gnomemeetings preferences.
type dmesg in a terminal, to see if the driver is loaded and your camera detected.