It was The Book Chook's suggestion, and she has written a number of posts about using image editors for literacy teaching that are worth a read.
I found the program very classroom (and CRT) friendly as it doesn't require any login and it is easy to use a file or a web sourced image - so, you don't even need a camera in order to use it.
I've used prezi as a kind of album to display the photos I made on iaza. Prezi, a web-based alternative to powerpoint has a free basic model that older primary students could enjoy, but it requires an email address to make an account. (Also, there is a 30-day free trial of the offline program available). The website has a number of video tutorials and examples to get people started and I found them informative enough to make this without any other guidance. It is a slightly idiosyncratic program, so kids will probably need a number of sessions to get the hang of it and make anything. Could be useful for story-boarding, making comics, and organising information.
This embedded prezi seems to take most of a million years to load (and even then struggles). You can also view it through the prezi site. Click on this sentence to find it there!
I highly recommend checking it out.
