VIdeo Conference Between Mac and PC

Well... I have been researching and many of you already know that one of the best (if not the best) application out there is 'Skype' (www.skype.com). This is a cross-platform application, video conference, chat, file transfer (a bit slow) and VOIP (voice-over-IP) telephony. This is a sweet application and will allow you to have voice/video conference with any user on Windows or Linux, naturally, as well as Macs. What is best? It works very well behind firewalls. Another application you should consider is 'Yahoo messenger' (http://messenger.yahoo.com/webmessengerpromo.php).
It also performs well between PC and Mac. You can also use it for video conference, chat, file transfer and all... But it is a bit slower than Skype, because it works through a server, whereas Skype works through direct connection (P2P - Peer 2 peer).
Another application that can be used for video conference (no audio support yet :'( ) is 'aMSN' (http://www.amsn-project.net/download.php). This is a MSN clone and is Java based. It is very good if you are looking to replace your Windows Messenger. It supports animated icons, you can add your own, transfer files and send audio clips.
I suggest you try these and see what is the best for your needs.
Please, if you know of any other conference software and would like to add to the list, post your comment and I will give it a whirl!
Enjoy!