You can also chat with anyone who has an AOL Instant Messenger (AIM) screen name and uses a chat client that supports AIM, whether on a Mac or PC. (For audio or video chats with PC users, you need Mac OS X v10.4.9 installed on your computer.)Cross-platform video chats without using the AIM client? Eeeeexcellent. (Of course, Skype video is free and quite good, but this is cool too.) If you can, try it out and let us know what you see; we'll post screenshots if we get it working.
Update: Some clarifications coming in via the comments now. iChat <-> AIM video and audio was working with versions of AIM prior to v6, but not since. The 10.4.9 updates to iChat may restore the video functionality for the newer AIM clients. For a very, VERY thorough walkthrough of the cross-platform video chat config (including links to download AIM 5.9 if needed), check out this page at MVL Design.