If you use eBooks and don't know about Calibre, you've been living under a rock. Calibre, designed by MobileRead.com's own Kovid Goyal, is the swiss army knife of eBook tools. Originally designed for Sony's PRS-500, it has grown over the last five years to support most popular devices as well as a few less popoular ones. It allows for conversion between many formats, reading books on a computer, downloading periodicals...periodically, and acts as a server so that you can download your saved eBooks wirelessly from your computer to your devices as easily as you would from your device manufacturer's store. This app for Android is the client for that server feature.