abrt-gui needs dbus-python and rhpl, but these requirements are missing in spec file.
Yes, you're right, and looking into the gui code I realized, that even more python packages are missing in requires :-/
abrt-0.0.4-2.fc11 has been submitted as an update for Fedora 11. http://admin.fedoraproject.org/updates/abrt-0.0.4-2.fc11
abrt-0.0.4-3.fc11 has been pushed to the Fedora 11 stable repository. If problems still persist, please make note of it in this bug report.