Fully interactive Jeopardy-style end of course review. All you need is a computer attached to any kind of multi-media projector. My students really like this every year; it breaks up the monotony of state test review packets. Plus, by setting the rule that if every student isn't working on a question that group is disqualified from earning points that round you will have 30+ eyes around the room helping to make sure each students is at least attempting the problem. Double win! And I apologize for the run-on sentence, I teach math.
Students are partnered up or put into small groups and each student receives a whiteboard, marker, and eraser. I usually only have enough calculators for one per group, but most questions don't need a calculator anyways if they haven't been using them much during the year. The teacher asks each group, in order, to pick one question and then the whole class works on it. Once I've determine enough time has passed for that particular question (varies between 30 seconds to 3 minutes depending on the difficulty), the group choses one board to be shown as a representation of their answer. The group that chose the question earns full points for correct answers, and all other groups earn half points for the correct answer. Incorrect answers do not lose points, instead they just do not earn any points that round. I keep score on the board so each group can see where they're at throughout the game. When time is almost up I give them a "Final Jeopardy" question. It is usually one of the 500 point questions that hasn't been answered. "Expression - 500" tends to be my favorite since it's blows their minds and simplifies down so nicely.
The questions are broken down into 100-500 points for each of the following categories: Equations, Inequalities, Quadratics, Expressions, Polynomials, Functions, and Statistics. Each slide is easily editable if the questions are too hard for your class, and the answer slides will still remain synched as well as long as you only delete the content and not the actual slide.