45902, "New feature! Chat with your orkut friends."
45903, "View orkut profile"
45905, "Change how your orkut friends are shared with Google Talk."
45906, "Send scrap"
From the other side, here's an example of mail invitation from orkut.
Your orkut friend, [email], would like to chat with you using Google Talk.
Google Talk is a downloadable Windows application that lets you chat, make free voice calls, and share files with friends inside and outside your orkut network.
Now, it's easy to add your orkut friends to your Google Talk friends list. You'll see their chat availability in orkut, and you can even send scraps (and get scrap notifications) right from Google Talk!
But if you want, you can disable Google Talk's integration with orkut.