On March 13th I gave a talk about Random Forests at the NU Machine Learning Meetup.
The link for the talk is here: http://www.meetup.com/NU-Machine-Learning-Meetup/events/107077992/
The file with the PPT slides is named "RFtalk_NU.ppt".
If you click on the filename below, you can view the slides.
If you click on the down-arrow (below, to the right) you can download the file.