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You can find various guides of Ariba Contract Management under "Right hand Top corner" of Ariba Home Page :- Help->Guides.
I hope this should help.
I have found a few links that compare the features available with each of Ariba's solutions.
There is a document named "Selecting the Right E-procurement Solution" which can be downloaded from the below link:
The below weblink on the various "Procurement" solutions and some case studies & whitepapers should also give you more info:
Hope this helps.