I can't code at all, but I'd be more than happy to test mobile posting for DreamWidth as it develops. (Though, I have a Samsung Jack rather than an iPhone or a Blackberry, etc. It was the phone that came free with my contract.)

Also, have you thought about doing something like a vGift or some other thing to raise money for specifically putting out mobile DreamWidth applications? Not everyone's a fan of Virtual Gifts but I haven't minded getting them for myself or others when they're a way to raise money for charity or a service that would be beneficial.