I just found out I have a spot in the BJCP tasting exam at NHC, so on to mad studying!! I was looking around for visual guides and comparative tools because I know I learn best when I can see relationships between things (like beer styles). I found a site with style characteristics represented visually which I thought was nicely done. The guy has four more other than the one here on this page under "Beer Recipe Design". I seem to have to reload the page sometimes to get all of the images to show up, so I hope posting it here doesn't crash it.
http://homebrewmanual.com/resources/ 
