Some time ago I decided to take exam 70-503 TS: Microsoft .NET Framework 3.5 – Windows Communication Foundation Application Development so I decided to register for the exam for today. And today I attended the exam and passed. It is worth to mention that I used a promotion code submitted to my by Microsoft because I registered on Microsoft Visual Studio 2008 Learning Portal to be the first to know and save 40 percent on select Visual Studio 2008 exams.
I prepared for exam during the last week (august). I basically studied from the Microsoft books suggested on the Exam page: Microsoft® Windows® Communication Foundation Step by Step and Inside Windows Communication Foundation. In addition - I've a lot of hands-on experience with WCF during the last 1-2 years.
The exam consist of 43 questions and is scheduled for 140 min. You'll not find any exam simulator for this exam at this time as far as I know, so if you wish to prepare for the exam just get some hands on experience and study the books.
The next exam planned is: Exam 70-504 TS: Microsoft .NET Framework 3.5 - Windows Workflow Foundation Application Development