I am trying to implement Admob in Android and I am seeing requests coming into AdMob. However, I am not seeing the Admob ads being displayed on the Android screen in the emu
Make sure that the layout the AdView is embedded in does not impose any padding on the AdView. The AdView's size has to be exactly 320x50 dip. It does not show up if it does not get enough room.
Also check the log output of your device. In Eclipse switch to the DDMS perspective, select your device and watch the LogCat output.