Pretty much what the subject says. Google tells me that Skype came to be in 2003, but I'm trying to find out if it was in common enough use in 2008 that it won't seem anachronistic. Also, most older references seem to lean towards Microsoft/Linux OS. Was it available for Mac in 2008? I tried all the google fu I could think of with combinations of skype/history/mac/2008 without much success. I also searched through the technology (misc) tags here in the comm. Any help would be appreciated!
Alternatively, if Skype wouldn't be realistic for my time frame, is there another common way to video chat that would have been available?
ETA: Great answers, thank you all! I realize from some of the answers that I should have added a couple more details to the question. My character is in the US, talking with someone in the US. Having video is the important element - - he needs to be able to see things on the other end.