Google did a good job here. Just make sure you’re logged in to your account and follow the direct link to permanently delete your Orkut account.
For more info, check http://www.google.com/support/orkut/bin/answer.py?hl=en&answer=11596
URLS:
http://orkut.com
http://www.orkut.com/Main#AccountDeletion
Please note that AccountKiller.com is not associated with the business listed on this page. AccountKiller provides easy-to-understand instructions and guides on how to cancel charges and relationships from the list of businesses on our site, we have no affiliation with these businesses.