The Chronic Dev-Team has released a minor update to Greenpois0n that brings a fix for iBooks and the Apple TV 2G Wi-Fi bug, according to OPK.
updated #greenpois0n builds for win and mac (RC6.1) are now live, these include the ibooks fix
a fix for the atv2 wifi bug has been made
You can download the latest release from here. It can be run on top of earlier builds.