Another use I have been exploring is informal panoramas. Taken without planning or tripod etc. Simply when faced with a scene to big to shoot, just taking a series of 4+ images and throwing them at the new Pana tool in LR.
The latest LR is much improved in making panoramas, and outputs a new RAW file (DNG), which is very nice. It even works very well with Fisheye shots - but only with large overlaps between the frames - as most of the fisheye frame is actually discarded by the program.
Using a rectilinear is much more forgiving as much more of the frame can be used (with no corner issues to cause problems). So even when you are a bit sloppy with overlaps, it tends to work really well. I think this is a particularly valuable use of the corrector port.
This one was 7 verticals - this is just cropped and straight from LR. It needs a few tweaks to Photoshop to be honest (there are some repeated fish!) - but as a 8 click solution (7 underwater and then one click in the software in LR). I think this is a really nice and super easy:
RS15_am-16880-Pano.jpg 820.62KB 12 downloads
The original images here were shot with 20mm at f/10.
I did some really extensive ones with up to 58 frames shot - but I have not had time to build them up, yet.