There are a number of android application stores in the internet from where you can download a lot of android applications. However, some of these Android application stores would require you to download its own personal app first. A few app stores may not even have what you are looking for, say eBook reading apps and comic books apps.
For people who read a lot through their Android phones, Google presents the e-Reader android application featuring almost all the available eBook applications, comics and other good apps with options of downloading alternative app stores as well. All the apps available in the e-Reader are web based, which means you will be able to download the apps from the web directly to your Android device.
The most important feature of Google e-Reader is that the downloaded applications will work on any Android powered tablets, ranging from low end to high end tablets. Google e-Reader is still in the beta version but still reliable.