All of the AP Statistics notes that we have listed below are fantastic. A great way to supplement your textbook and class notes, and also a great way to review the most important concepts for your exams.
An amazing set of AP Stats notes, organized by chapter. You can view these in html or PDF format, and they include lots of helpful diagrams and charts.
Arnold Kling has another large collection of AP Statistics notes and handouts. You can also listen to the lectures that accompany each set of notes.
Another solid set of AP Stats notes. These follow The Practice of Statistics textbook and cover all the major topics.
Chapter summaries from Dan Shuster’s site for each of the 14 chapters of The Practice of Statistics (3rd edition). These are very clear and concise, an excellent resource.
This is an 8 page cram packet that covers the key concepts with no fluff. A good option to read through during your final night of test prep.
Another 8 page PDF that reviews the whole Stats course. You should definitely spend some time going through this one.