No more invitations for Orkut, its finally opened to public.
Anyone who has a Google Account can use them to login to Orkut

So Join Orkut Now with ur Google Account or
if u dont have one create one to Join Orkut

Simply visit http://www.orkut.com/JoinCreate.aspx

Tip: Next time u want to invite anyone to Orkut
send them a Gmail Invite would be better

Apart From this some new features this DiWali

1. You can choose to get friend requests from everyone or
   only from people that speak your language.
   Please adjust your Orkut Settings


2. Add upto 10 Moderators to Communities


3. New Scrapbook Features

• Quick Reply to scraps
  

• Delete/View multiple Scraps

Also read Last Update on Orkut where new search
& mutual Friends feature was introduced