It is the 0.3 branch from the repository. It's a linux binary as stated on the download page. I'm not sure which Glest, it should work with the latest. I'm not sure about the size, I just compiled, made sure it ran on my machine and uploaded. It was just done quickly so that people would have something to download. Don't be too worried about this release, it shouldn't be expected to be stable. I didn't upload version 0.2 because it didn't compile for me.
Edit: I compiled on OpenSUSE 10.3 if people wanted to know.