Today I pushed an importer script for Ning. I’ve only used it for one site, and plan to use it for a second site soon. I’m sure there will be many improvements to be made because no two imports are ever the same!
As with all importer scripts, edit the constants near the top of the file to point to your Ning archive files and set other options specific to your data.
Let us know if you’re doing an import from Ning. Contributions to improve this script are welcome!
NOTE: Ning 3.0 (the newest?) doesn’t have a way to export your data at all. So this importer can’t help unfortunately.