Hi, I've just completed a semi-lengthy project where I've developed the same application for both Android and Windows Phone 7 and lived to blog about it. I normally don't post just to link to my blog in forums as that's often regarded as spam, but I hope this might have some interest for developers who consider going from either platform to the other, and know little about the second platform (whichever it is).
The post focuses equally much on the publishing/market aspect of the process as well as the coding. It does not go deep into coding, but can give new developers an idea of the differences of the two platforms.
See the post here: Android vs WP7 for developers - A case study.
Feel free to comment and discuss here or at the blog.