Problem seems to crop up with gtk and fedora for normal eclipse users:
In particular is sounds like this was "Fixed upstream" in fedora so best advise is to update and try again.
There is a workaround in the first link...
Gtk-Message: Failed to load module "canberra-gtk-module": libcanberra-gtk-module.so: cannot open shared object file: No such file or directory.
This error was seen on 64 bit version of Fedora it appeared inspite of an RPM named libcanberra-gtk2-0.10-2.fc10.x86_64.rpm being present on the system. Apparently some applications are looking for the 32 bit version of the rpm (eg: netbeans, zoiper) and you can solve it just by adding the 32 bit rpm.