This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
The "OpenSOA Platform" that is described in the book probably shares many similar features to what is offered by IBM. For example, IBM is a major supporter of the SCA initiative, and I believe that technology is now integrated into their SOA offering. The OpenSOA platform also uses SCA, in this case the Apache Tuscany implementation. I'm not intimately familiar with IBM's offerings, so I can't comment to specifically.
As for BPEL, my book advocates using JBoss jBPM in lieu of BPEL. Why? In part, it's because BPEL is really oriented around orchestrating SOAP-based web services. JBoss jBPM, on the other hand, is not tied to SOAP, though I describe how jBPM processes can be invoked via a SOAP call, as well as act as a client in consuming SOAP services. Additionally, jBPM, as a true BPM solution, is very strong in its support for human interface tasks -- something the BPEL standard has only recently begun to address.