I recently scheduled the opportunity to take the Prometric "Test Drive". Anyone is eligible to schedule a "Test Drive" regardless of whether you are scheduled for an exam at a Prometric Testing Center or not. The cost is $30 and the session is 30 minutes. Overall, I found the experience positive and valuable.
Not everyone may be close enough or have the inclination to take a "Test Drive". Therefore, I documented my personal experience. Click here to read about it "step by step".
The ABO sent an email on 5/13/11, to all Active Candidates, indicating that a Prometric computer-based tutorial would be available on the ABO website beginning 5/16/11. I imagine the tutorial may be similar to the one available during my Prometric "Test Drive".
The ABO's Board Certification Examination Candidate Guide, which is available on the ABO website, also provides valuable information regarding the Prometric "testing experience".