Well, what UPS had promised would be a short delay turned out to be not quite so short.
UPS finally deigned to deliver the Zigduino parts to the assembler and tell me about it. Therefore the Zigduinos are (finally) in assembly. I don't have a final date for the delivery of the whole order, but I expect to have the first production samples with me at MakerFaire SF. I'll keep you posted with any new news on the production front, but it looks like most of the major troubles are now behind us.