The web server seems somewhat chunky, which may be a sign that they're pulling up stakes so grab it fast.
Edit: Also, this isn't the full source. It's missing the proprietary eInk drivers and such. There' are threads somewhere in the archives of this forum where jcase and robot talked about it, and listed the parts that grepped missing, along with a bunch of folks telling him he was mean to demand it because enTourage was such a nice and supportive company. Ha ha.