Arvind created a new apps for orkut user which let you add Gtalk widget on your account so that you can chat with all your Google Talk friends from orkut.
This application can be found here.
This integration although unofficial strongly prove demand for better gmail chat & orkut integration. I have seen many friends switching to facebook and enjoying their recent chat feature and I hope Orkut will answer back soon with a better integration.
Thanks sauravjit for tip. 🙂
Link: Add Gtalk Orkut App