The most-desired medical app for Android is UpToDate. The second most-desired medical app is Medscape. These are the apps that Android users are looking for. They're looking for UpToDate and Medscape for Android, but they're not finding these apps because these apps aren't out there yet.
You can access UpToDate on any mobile device browser. That works quite well. I've even blogged about accessing UpToDate on Android.
Medscape Mobile for Android should be coming soon... (not exactly sure when, but it should be soon)