A good place to start is here..."Deploying Cisco Wide Area Application Services (Networking Technology) by Zach Seils, Joel Christner " on Amazon. It gives you overview and deployment scenarios.

Another place is: http://www.cisco.com/en/US/partner/products/ps5680/Products_Sub_Category_Home.html

Also, there are a bunch of training / overview presentations at Cisco-Live, which you can access via http://cisco-live.com/, however you need to have an account to access.

Hope that helps,

Dan