Dugee Virginia Leandro will lead session number 4 of the 401 study group (11:00 to 12:00), and will cover chapter 7 of the SFDC Platform Fundamentals pdf (available in the files section of this meetup). This chapter covers what is possibly the MOST difficult part of the SFDC platform: security. For this session, you MUST read the chapter and run through the exercises on your own, and come armed with your questions. Jason Ouellette's book also has a fantastic treatment of this subject. Virginia has assured me that she will send you down to the principal's office if you fall asleep during her presentation.
Dugee Paul Boiko will lead session number 4 of the 501 study group (12:30 to 1:30) and will cover chapter 4 of the Apex Programmers Guide (also available in the files section of this meetup). If possible, please read the chapter and run through the exercises on your own, and come armed with your questions.
Additional notes: If you are studying for either the 401 or 501, you are welcome to the other section as well. No tests, just great support and camaraderie.