Here is a tool that lets you add content and create any course you want.
Well I'm going to join in on the conversation, but I don't have much to add yet. I just got an ipad from the school and we are looking at getting a cart of them to share between four classes. I think I've spent about 9 hours looking at apps this week! So much garbage, but some great stuff too. I agree about the earlier posts on making our own apps. Boy if I had that time and knowledge I feel like I could really make something neat. (and a lot of money...)
If anyone has links or "must haves" to share please send them my way. I teach 5th grade.