What are some Android eBook options & eReader Apps (Kindle, Nook, Google Books, etc.)? What are my options for reading ebooks on my Android device?
There have been a number of questions about ebooks but I thought I'd pull the basics together into a Community Wiki.
Quick note on cross platform ebooks. It's possible to read the DRM'd Epub files on several devices, for example the Google books can be viewed by the Nook app.  You have to do a couple things like sign up for Adobe Digital Editions... (this needs more explanation).

Lets try and keep the same formatting.  If you come up with a better format then change this template too...
App Name:
( link to the app ↑ )

Marketplace - Where can you get books?
Format -  What file formats does it support?  Does it use DRM?
About - Simple explanation of what it's features, pros and cons are...


You can copy and past this for easy formatting:
##App Name: 

 - **Marketplace -** 
 - **Format -**  
 - **About -**
Aldiko:
Only does non-DRM'd ePubs.  There are thousands of these books available but you're not going to be getting newly released copyrighted books.  Great user interface but the no DRM limitation is a problem.  Aldiko also has a paid app that has more features but it still doesn't let you load new DRM'd books from the major retailers.