Amazon's Appstore for Android currently requires a somewhat lengthy application installation process, due to the fact that you must first download an app and then install it using the default Android installer or another similar utility. More specifically, you'll currently average four "clicks" to install an app from Amazon's Appstore, while a Google Android Market app install typically requires just two clicks.

The time it takes to install an Amazon Android app versus a Google Market app isn't really that much different, but the extra steps can be frustrating when you're downloading multiple apps at one sitting.