What provisions exist to handle scooping when there are multiple reviews of research papers?
After writing to a number of journal and conference organizers, KDD and IEEE responded by saying that putting up a document on arXiv and then submitting the same document to one of their conferences or journals is ok. IEEE officially mentions it here. There's also a nice answer here.  

UPDATE:
As of 2019, KDD no longer allows pre-prints on ArXiv due to their double-blind policy.
As of 2020, IEEE started their own archive named TechRxiv, and they still allow pre-prints on ArXiv and TechRxiv.