What are some alternatives?
When comparing GoodReader and Amazon Kindle, you can also consider the following products
FBReader - FBReader is an e-book reader for various platforms. Features:
calibre - Ebook manager, viewer & converter
Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.
Cool Reader - Fast and small cross-platform eBook reader for desktops and handheld devices
Sumatra PDF - Sumatra PDF is a slim PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI viewer for Windows.
Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.