There is a lack of Oriana guides that focus on her role as a support. Here is mine that is tested, and proven by myself.
Take a look at it. If you are interested in her as a support, it may help you out. It still needs a lot of polish, but the information is sound.
© 2013 Riot Games, Inc. All rights reserved. Riot Games, League of Legends and PvP.net are trademarks, services marks, or registered trademarks of Riot Games, Inc.