LegOS - Open Source OS for Lego Mindstorms

An anonymous reader writes "While a Lego Mindstorms R2D2 might look cool, what OS is your robot going to run? Let me tell you, what it wants to run is LegOS. " I can't find mindstorms anywhere around here. I want some so bad its just sick. Especially those Star Wars Mindstorms. Can anyone attest to the usability of LegOS? As soon as its good, I'm just gonna have to bite the bullet and buy me some Mindstorm.