Eurobricks member Whitefang has done an awesome review of the Collectible Minifigures Series 9. You may remember him reviewing every other series over there. But this one stands out as one of the best.
Complete with a Cyclops, Forest Maiden, Battle Mech, and Plumber, this series may be one of the most sought after ones since series 1. Which you'll remember was only so sought after because of the very limited quantity.