I take notes using my iPad -- in a very visual way. Using images as well as text, I draw the notes using my fingertip and a drawing application like Sketchbook Pro or Brushes. These slides supported my Tech Talk at Macworld|iWorld 2012 about this special kind of note-taking. See more examples of my work on Flickr: http://www.flickr.com/photos/ninmah or visit my blog: http://digitalfacilitation.net
Photo credits: Slide 2 photo by Alan Wolf; Final slide photo by Alan Levine.
Clipping is a handy way to collect important slides you want to go back to later.