You could have downloaded GoogleTalkPlugin 5.41.3 for Mac from our application library for free. GoogleTalkPlugin for Mac is included in Communication Tools. The actual developer of this free software for Mac is Google. The following version: 1.0 was the most frequently downloaded one by the program users.
From the developer:
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, iGoogle and orkut chat.
From within these services, you can have an actual conversation with someone (seriously, out loud), or even chat face to face over video.
You may want to check out more software for Mac, such as Amigo, PhoneAmego or PastebotSync, which might be similar to GoogleTalkPlugin.