iChat is great communication tool for mac users. It’s possible to use Camera, Voice Chat and File Transfar. And, expressions of this application is rich. But, it needs .mac account. Most my friends use Jabber account like google talk.
I tried to transfar filed to Mr. Ryuni via iChat (Our account is google talk), but it was failed.
There are many interesting chat protocol over the world. And many chat applications support the prural protocols. But, to contact all friends, we have an account on all protocols.