The CHILDES manual is on line @ http://childes.psy.cmu.edu/manuals/chat.pdf
This manual is shorter: http://childes.psy.cmu.edu/intro/stephany.pdf
Choose a language: http://childes.psy.cmu.edu/browser/
Look at http://www.bu.edu/linguistics/UG/course/lx700-s02/childesclass.html
Final projects: experiment papers