The latest beta release of 2.0.0 has just been placed on sourceforge. I promise one day it'll be non-beta, once I get around to writing some documentation for gap5 most likely. As with previous 2.0.0 beta releases the differences are primarily in Gap5. See the release notes for more information.
I have tested and built in on a 64-bit AMD Opteron system using Debian Etch. I appreciate this isn't a particularly modern operating system, but please let me know if it fails on others and I'll try to get some virtual machines again to test builds on.