Thanks to great work by Fraser Speirs, author of FlickrExport, the upcoming 1.3.3 release will work with 23. I know, because I’ve tried it: This photo was uploaded using FlickrExport. Fraser’s own post is here.

If you can’t wait till the release, you can build it yourself (see the last comment for help with configuration).

Once you have the release, all you need to do is:

defaults write com.connectedflow.flickrexport FlickrHost www.23hq.com

You can do this after installing, but before launching iPhoto, and you can do it as yourself, don’t need to be admin.

Thanks, Fraser!

UPDATE: 1.3.3 is out.