The people are saying that man which hacked AMX forum, he hacked before few other forums, because they were using something ilke "IPB" (which - like they say - is much insecure). More info read here.
IPB is very secure forum but this version that is used in to the AMX forums is to old. I think is IPBv1.3. Well they can update fully free to the latest much more secure IPB version. I think that the latest version now is IPBv2.1.1 witch have much more functionality than the 1.3 one.