I'm using KOReader with the PocketBook Era. The integration is top notch. Installation is simply done by copying the KOReader folder to the right directory on the device. After that you can set KOReader as the default reader, which means that you keep on using the original system software and library, but books will automatically open in KOReader.
This lets me use "Mail to PocketBook", Dropbox sync etc. or the fantastic Push-to-Kindle browser-plugin in combination with the fantastic KOReader. No flashing or jail break required.
replies(1):