My first windows mobile application?

So I think I came up with an idea for my first Windows Mobile application. A Windows Live Writer type application for my Windows Mobile phone. I have an AT&T tilt, and it sure would be nice to be able to blog from the road without having to load up my website in a browser and hope to the post goes through. Anyone developed such an app? I've not done any Mobile development yet, I tried to use XNA Studio the other night to do some development for my Zune but figured out it doesn't work in Vista 64 yet....

Maybe I'll get to that in my free time, wait, what free time?