Google has added the ability to chat and make VOIP calls directly from a Google account holder’s Google Personalized Homepage with the Google Talk Gadget.
The Google Talk Gadget can also be placed on non Google pages or blogs, or your favorite homepage destination (not sure if it would work on PageFlakes, MySpace or NetVibes).
From Google Talkabout : Google Talk Gadget
We know a lot of people love being able to chat with their friends in Gmail Chat, so we created the Talk Gadget to offer that experience in other places, starting with the Google Personalized Homepage. You’ll also find all your Gmail and Google Talk contacts organized for you in the Talk Gadget. And just like with Gmail Chat, you don’t have to download and install software to use it. One thing we really like is that it looks and feels the same on a Linux desktop as on a Windows laptop, and it also works on Macs. No matter where you go, all you have to do is login to your Google account, and there it is.
And if you have a webpage or blog, you can put the Google Talk Gadget in those places too, so your visitors can sign in and start instant messaging right from your page. If you post your username next to it, visitors can add you as a contact and start chatting with you right away. Like most other gadgets, you can do this by pasting a single line of code into your page, which you can find here.