Finding who has added you to their crush list

Add all your friends (or the one whom you want to find) in your crush list.
If any of them has added you to their crush list before, you will get an email.
Delete everyone from your crushlist.
This is the easiest way to find whether someone has added you to their crushlist.

Write Anonymous scraps

Create a fake account.
Write the scraps to the person you want.
Delete the account.
Your scraps from the deleted account becomes anonymous.

Knowing Email ID of any profile on Orkut

Ignore the person of whom you want to know the Email id.
Open your Gtalk of the same account as Orkut.
Go to Settings -> Blocked
You can see the ignored person's email id.