My partner and I teach photoshop at the high school and have collected quite a few resources and developed quite a few lessons that explore the basic functions of photoshop.
I will dig up our info and post it on my www.teachingart.info site for the coming school years use.
I am slowly getting pages, links and other things for the site.
Please keep sending any info/links/ etc. to firstname.lastname@example.org
www.puyallup.k12.wa.us/high/emerald (our high school)
www.erhstv.com (my classroom site)