I just installed the iLife ’09 suite, which includes version 8.0 of iPhoto. While I haven’t had time to try out any of the new features, I did check to see if my ExportToArchive plugin still worked. I’m happy to report that it does still work. If you already had it installed, you don’t have to do anything; it will just work. If you don’t have it installed, the installer works with the latest version of iPhoto just fine.
If you encounter any problems using ExportToArchive with iPhoto ’09, please let me know.