See the announcement for more details.
Get the Windows Demo: Blazed-Demos
*nix Users: dsss net install blazed-demos
What does this mean for ArcLib? It means, finally, that a major roadblock for Arc v.3 (polygons in physics) is removed, and all the built in Box2D Lite stuff that was built into ArcLib will be removed, as well.
Also, the next release of Tango looks like it will feature XML, so I can remove my own XML code from ArcLib in the next release. I can also remove a bunch of my templated code in ArcLib, thanks to Tango.