I'm giving away a new High-Res sIBL every month. Been doing this for almost 6 years now, amassing a huge sIBL Archive. Some of them are also on display in the Pano Gallery.
Most of my panos are shot with a 10.5 mm Fisheye on a Nikon D300s, stitched with PTGui and cleaned up to perfection in Photoshop. If you want to know more about the process, read the HDRI Handbook 2.0.