Android Candy: Every Hero Needs a Sidekick
I've touted the awesomeness of Calibre in the past. And although the Web-based calibre2opds still is an awesome way to access your eBook library, using a native Android app is even smoother. If you have your Calibre library on your local network, using Calibre Companion ($3.99 in the Google Play Store), your Android device connects to your library like a device connected via USB. It's possible to load books directly onto your device without syncing your entire collection into the cloud!
(Image from the Google Play Store)
I admittedly still use calibre2opds in combination with Dropbox to make my library accessible remotely. But, if you're concerned about your books being on the Web, Calibre Companion is a local network solution. Check it out today at https://play.google.com/store/apps/details?id=com.multipie.calibreandroid.