I've got two toddlers who love video chatting with grandma and grandpa. It starts out cute, but quickly deteriorates into the two of them jumping around in front of the different effects and backgrounds.
More iChat Effects has made it worse.
This free download adds 48 new effects to iChat, including outer space, a mildly disturbing cube effect and a pretty cool hologram. More iChat Effects is a Universal Binary and includes an uninstaller, just in case you don't want to chat as the Mona Lisa.