Nirous.io seems promising, meteor (since it's based on node.js) may run on their boxes (http://mark.shropshires.net/blog/developing-meteorjs-apps-ip...), git is integrated, and their devblog states that they improved the experience on iPads recently.

I'll definitly try it out, thanks!

Cloud9 seems to be unsopported on iOS devices... very disappointing since on desktop systems I already have (insert your dev stack) available.