Not all apps are able to broadcast across iChat. It may not be obvious you can’t just fire up Firefox and share your browsing via Leopard’s new iChat. In fact, which apps CAN you do this with?
And if there’s anything else… I’m not yet aware of it. You’d think Safari 3 would be good to go. Nope. If you know of any iChat Theater enabled apps please pass along the knowledge via comment or linkback.