To numerous to mention without an essay. Have a look at some of these discussions.
http://itknowledgeexchange.techtarget.com/itanswers/open-it-forum-what-should-i-ask-my-cloud-storage-vendor/
http://itknowledgeexchange.techtarget.com/itanswers/open-it-forum-what-are-your-views-on-social-networking-platforms-in-your-network/
http://itknowledgeexchange.techtarget.com/itanswers/open-it-forum-in-defense-of-cloud-storage/
This should get you started. However securing cloud based products (or setting them up in the first place) is a HUGE topic with so many aspects each of which is vital to security and reliability. It's time to get some consultants you trust.
Last Wiki Answer Submitted: July 19, 2011 1:40 pm by ErroneousGiant3,120 pts.
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Identity and Access Management
Data Security (CIA)
Network Security
Virtualization Security
Physical Security