Finally found some time to pass the 70-235 exam.
I found the exam quite easy and I think anyone who is using BizTalk a little more than basic features would pass this exam.
As for the questions, most of the questions were related to the new BizTalk 2006 features and covered almost all functionality: solution design, deployment, diagnostics and debugging, BAM, BRE.
There were a lot of questions about the tools that are available for the BizTalk developers and administrators.