IBM has been an advocate of BPEL since the beginning, and its developerWorks site has a number of pre-existing articles and tutorials that discuss BPEL and various IBM tools and technologies.

Please note that even though several of these articles are only a couple months old, both the products and standards mentioned may have newer revisions. Please check both IBM product versions and BPEL standards versions.

Here are a few of the recent articles you may find of interest:

Transforming business models to BPEL with WebSphere Business Modeler 6.02

IBM® WebSphere® Business Modeler (hereafter called Modeler) is a powerful tool for business analysts to accurately model their unique business processes. This article shows how Modeler transforms different constructs into WS-BPEL. The graphical representation of the WS-BPEL process for this article comes from IBM WebSphere Integration Developer (hereafter called Integration Developer).
URL: http://www.ibm.com/developerworks/websphere/library/techarticles/0706_fa...

End-to-end BPEL business activity monitoring with IBM SOA tools: Part 1: Modeling for process execution with WebSphere Business Modeler

This is the first article in a series that journeys through the process of how to develop an end-to-end BPEL business activity monitoring (BAM) solution using IBM tooling. In this first article you build the process model and business process measures in WebSphere Business Modeler that you'll use throughout the series.
URL: http://www.ibm.com/developerworks/websphere/library/techarticles/0706_pe...

End-to-end BPEL business activity monitoring with IBM SOA tools: Part 2: Developing a BPEL workflow application in WebSphere Integration Developer

This is the second article in a series that uses IBM WebSphere Integration Developer to import the business process model that you developed in the previous article using WebSphere Business Modeler. In this article, you refine, compose, and assemble a fully functional BPEL business process workflow application that is capable of being deployed onto an IT infrastructure such as WebSphere Process Server.
URL: http://www.ibm.com/developerworks/websphere/library/techarticles/0710_pe...

We'll post addtional articles of interest! Main developerWorks site URL below.