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.
You can browse through the source code via a SVN viewer. You can also download the code (with a SVN tool like TortoiseSVN or the Eclipse SVN plugin) as described on the link you included in your post. Let me know if you are experiencing problems with this.
Author of Activiti in Action and Open Source ESBs in Action