I use adwhirl in one of my android applications and recently I started using house ads which have been giving great results so far. Unfortunately I noticed all of my image ads were being displayed using the smallest scale available ignoring the correct screen resolution in most of the devices. After some research I found out that this bug dates from 2010 http://code.google.com/p/adwhirl/issues/detail?id=137. Since I know this is a very common issue with everyone running the latest sdk, I wanted to share the fix that worked for me.
Add the following line to your Android manifest file:
<supports-screens android:anyDensity=false />
I hope that solves that problem for most of you!