Originally Posted by sitlet
Kindle for android can only read books bought directly from amazon.
I just pasted text from a long article into OpenOffice, saved it as an odt file, used Calibre to convert the odt to a mobi file, saved it to disk, placed a copy in the Kindle directory / folder of my SD card (android Xperia X10), and started Kindle. The book is there and I can read it fine.
I did something similar for fbreader and aldiko and will compare, but it is definitely not true that the android kindle app can only read books from amazon.