Just looked at the apple page describing the new iChat 1.0 update.
To me it seems quite odd that Apple dose not have information on what has been patched. Mabey they are patching so iChat becomes capatible with the Apple Phone(formaly know as iPhone), or mabey something completeley else?This update renews the .Mac certificate required by iChat for encrypting text, audio, and video conferences.
This document will be updated as more information becomes available.