Yes, we have an import script available for SMF. Basically it's pretty
straight forward. Installing UBB.threads. Grabbing the importer from the members area and uploading it, and then filling in the info for the SMF database and letting it run.
Pretty much everything will come over except for Polls, Karma and User Passwords due to the encryption differences, so your users would just need to request a temporary password once the import is complete.