I think it's a "right tool for the right job" scenario. Most of the folks who object to putting data in the cloud are thinking about mission critical and highly private data and I'd definitely agree that nobody should be pushing that stuff up to the cloud.

But there's alot of data that isn't described by that. I recently worked at a company that had a need to allow geographically diverse users to be able to scan documents in and have those documents easily visible to other users. Essentially they were building up a knowledge base based on a set of their business documents. The documents weren't in any way private and the paper copies were still being archived off to a physical warehouse so data loss wasn't a significant worry either. For that scenario the cloud provided a level of convenience that probably couldn't have been achieved with the in-house infrastructure.