Blaze is nearing a 1.0 release. See Announcement. Blaze supports 2D physics for polygons, and has recently added joints. Since Blaze is too fast for me, I added some timing code into the Blaze demos that will cap the frame rate on faster machines.
I also replaced my XML code in ArcLib with the Tango XML code. The whole process was pretty simple, I only had one or two questions for the Tango folks about Tango XML, and then using Tango XML allowed me to reduce my lines of code count quite a bit, too.