Looks like
ooVoo has been around for just over a year or so based on press releases, but I'm giving it a try (with the slight nudge from a good friend).
It has voice/video conference (for up to 3 concurrent contacts in the free version I believe), IM/text, file transfer etc. Like Tokbox you can send a message with video to a contact if they are not around. I like the look of the Vista sidebar option - anxious to test it out.
I'll touch base with how it goes, but it will likely be my new toy for at least a week or so. Would be glad to hear from anyone who's used the free version - positives and negatives......anything??