There's a multitude of resources out there for Exadata and it can leave one EXA-hausted. Here's a list I've put together and invite others to contribute their comments and feedback.
Exadata Database Machine Product Information Page
Take a class! - Exadata Training I recently heard someone say that it's not like you just bought a new Ferrari and you don't know how to drive, it's that you just bought yourself a LearJet and you've never flown a plane before!
Exadata Learning Path
My Oracle Support
80+ Tutorials, Videos & Demos on the Oracle Learning Library - FREE! There's more. Check it out!
Exadata Forum on OTN
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Exadata on Oracle Mix
Oracle Exadata SIG
Have a great week!