Google Talk
Email conversations sometimes are just too slow. Why wait several hours for a response you can get in ten seconds? With Google Talk you can chat right from your inbox. Including video and audio chat. Google Talk users can see their colleagues’ status (online, busy, offline), allowing them to send a chat when you need a quick answer, they can even chat as a reply to an email message. And it’s easy to connect with your co-workers, because their IM accounts are connected to their business email accounts.

