iKspozher is buggy on my iPod. The shutter priority button sometimes doesn't work when I press it. The slider on the bottom to change the shutter speed also doesn't work. Perhaps its because I have a first generation iPod - I don't know. I also do not like the random advertisements on the top.
PhotoBuddy is much better. Also has a manual exposure look-up feature but uses presets. In addition, it tracks sunrise/sunset and moonphase, caculates DOF, Flash exposure, exposure compensation when using bellows, it has a count-down timer for bulb exposure... And if you have an iPhone, PhotoBuddy can also estimate distances of objects using the built-in camera. It's the same price as iKsposher but with no bugs.
I also use FNDMobile. It's a very nice and simple database for film/developer times. It would be nice if it came with more film/dev combos but I'm sure that more will be available in the future... Hopefully, they'll be automatically added with updates. It's pretty easy to add your own anyway. It would be awesome if all the information on DigitalTruth's Massive Dev chart was available for look-up on the iPod. The count-down timer is somewhat useless to me. If I were to use it, I have to go into the iPod settings and turn off the
I also use Fotomatic to connect to flickr and check out what is new from my contacts. It creates nice slideshows similar to those from iPhoto.