what is the error you are getting when you upload the data? note that web2py CSV import will be limited to what can be processed in 30 seconds, which limits you to around 100 rows.
http://code.google.com/appengine/docs/python/tools/uploadingdata.html is my favorite. use the tool to generate the bulkload.yaml and then download and upload. there is trickiness if you have blobstore items you are trying to sync between databases, let me know if you need info on that too.
