this may be obviuos, but when exporting multiple fields to the same folder (automatically named "Task Data"), save the next export to the folder above the "Task Data" folder. For instance, I named a folder under my grower "spring 2010 VT spread files". If you save the second export to the "Task Data" folder, it will create another "Task Data" folder under that, which I believe is wrong.

Also need to keep track of which fields you have exported (say, interrupted with a phone call, etc.) as I don't see a way to find that info in the export folder.