Well, I'm going to tinker with it a bit. Intriguing to say the least. It'd save me a step if it doesn't provide a bunch of overhead doing the "translations". Otherwise, I'll have to implement ES 2.0 backends on the rendering engine code I've got in hand for the titles I've in mind (And, I DO happen to have a few titles in mind...once I get one of them back on track for Gold master on the x86 Linux side of things...).
1) It's a Windows application...
2) It appears to support handling ES 1.x but NOT 2.x
3) It provides a wrapping for the missing pieces from the fixed functionality paths from OpenGL 1.2/1.3 to ES 1.x
So, it's probably something that someone could use as a crib-sheet for a Linux version, but it's of limited use to someone trying to provide similar abstractions for ES 2.X.