I recently added a new lens to my camera bag, the Canon TS-E 24mm f/3.5L. This is one of those weird tilt-shift lenses. It's not the brand new Mark II version of this lens, but the older one that has been out for a while. It is wonderful L-glass with the great red ring.
I've just started to learn how to use it. I plan on using it mainly for creative effect and in video shooting. Wish me luck!