Don't delete your Drupal variables table
Mon Deiu, what a nightmare. Drupal quit working, gallery quit working, lots of settings that used to be there -- now mysteriously gone. I had to grab my old table from the old site and rebuild the damn thing from scratch. Then re-install gallery and reset all of the Drupal 5.2 setting customizations that were made.
Damn phpMyAdmin. They really ought to add a "are you sure?" button to the delete buttons. That's twice I've eliminated tables inadvertently without meaning to. Thank Jebus for backups.