I've been experimenting a little bit with my 17-40mm lens lately. Ever since I got the full frame Canon 5D Mark II, I've pretty much been using my 50mm prime. I suppose I'm just not that used to the super wide perspective and slight distortion that you get around the edges of the frame especially at 17mm.
Here are a few of the pictures that I've taken with my wide angle lens, mostly at 17mm. I really love how sharp this lens is. Now all I have to do is get out and practice more.