In many years of consulting and using E2.0 and Collaboration tools, I think the best way to look at general ROI is by looking at an alternate reality and all the mistakes, misunderstandings, miscummunications, repetitions etc. that will NOT happen. ROI is also in the creativity, innovation and efficiency that are part of good collaboraion.
I'm not sure if anyone did a controlled study of 2 similar groups, one that continued to work as it did and the other adopted E2.0 over a period of time. Then the efficiency and innovation of the teams can be compared.
For the executive team, it requires vision and imagination.
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