I've committed a change to the importer (both versions) to handle product model adjustments. Attributes and options can now import and export their ordering and price and weight defaults. I've also fixed some problems in the PHP4 version that might have been causing problems for some of you.

I think there might still be issues with assigning options to products, especially if there are already existing options with the same name. I haven't isolated the problem yet, but it's something to be aware of.