When using BitLocker to encrypt your harddrives in Windows 8, you have the possibility to save them to the cloud:
Ever wondered where those keys ended up going? Just go to https://skydrive.live.com/recoverykey
Whenever you need to recover a drive, Windows will tell you the Key ID so you can match this up to the right recovery key. I will not go into details on why I needed them today however 🙂
As you may notice from the above screenshot, you can also delete your keys. Of course this is at your own risk - so be very careful.