Below is the timeline regarding my exam and result:
04-OCT-11 Received Letter informing exam passed. Able to see the OCMJEA certification on Certification History screen in CertView. Have to wait 45 days for the shipment of certification kit.
30-SEP-11 Received Letter informing Essay has been matched with Assignment and grading started. Check Pearson VUE score report.
29-AUG-11 Part III Essay @ Pearson VUE
26-AUG-11 Part II Assignment @ Pearson VUE
05-APR-10 Part I Multiple Choice Questions @ Prometric
By my exam experience, for part I & II, you must read JEE 5 Tutorial, SCEA 5 Study Guide 2nd (by Mark Cade & Humphrey Sheil), Design Patterns and Core J2EE Patterns. I bought Sun's exercise questions and Whizlabs exercise questions for part I preparation. Quite helpful.
For part II, just follow the diagrams in SCEA 5 Study Guide 2nd to fit you design in them (slight revision is okay). Not just me did this, many other people also did so. After done drawing diagrams, ask yourself if development team will be able to build a working and complete system following your diagram and assumptions. If you're not confident, check and modify your diagrams again until you're confident.
For essay, you must be quite clear why you choose a particular framework or technology over other alternatives. Try to ask yourself whys and prepare the answers by yourself. Must prepare the answers, otherwise you may not have enough time for the 8 questions when you taking actual exam.
During the preparation, don't hesitate to ask question in forum as there are many java elites and experts here. They have deep understanding of Java and JEE. Make full use of the forum resources.
Sorry I don't have much time to write more. Good luck to you, Ranchers!