I’m a wide angle lens freak stuck in a kit lens body. I had a Sigma 10-20mm super wide zoom for my first Pentax K10D and it stayed on more than 50% of the time. Later I rented a Canon 17-40 f/4L for a couple of days in San Francisco and shot a bunch of picts with it on my 5D. Awesome. Here’s a link to some of my wide angle shots on Flickr.
I thought 14mm was as wide as one could go on a full-frame lens. Imagine my surprise when Ken Rockwell posted his review of the extremely rare Nikon 13mm f/5.6 rectilinear fisheye. Check it out. No barrel distortion what so ever. It is truly amazing stuff.
Thanks, Ken!