gTalk now has voice and video chat

Since sometimes reading "lol" doesn't deliver the same punch as actually hearing your friend laugh at your jokes, you can now use voice and video capabilities in your Gmail chat. From within Gmail, you can have an actual conversation with someone (seriously, out loud), or even chat face to face over video.

About voice and video chat - Help Center
It doesn't say if it works in linux or mac though. Guess I'll find out soon enough

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