somebody on the PC side finally took a page from iChat. The new Trillian 3.0 has voice chat and decent video chat, both of which are compatible with iChat. Also, you can use trillian for msn and yahoo services too. So if you use a PC @ work or have PC friends you wish you could voice chat with without using another app like skype, this is the answer.

http://www.ceruleanstudios.com/learn/