Friendly note for those that use iBooks. Ibooks spawns a storeaccountd process that relentlessly fires off so many internet connection attempts that it actually maxes your computer's CPU, get's your fans all worked up, and rapidly drains the battery. This only happens if it can't connect so places like on the airplane or behind a firewall. As long as iBooks is open the process is un-killable. So essentially I can't use iBooks on the go.