I've committed this version to the repository after making some changes. Mostly these were getting the code up to W3C and Drupal standards. I took out the variable "uc_independent_catalog_blocks" because they were always being displayed before it was set. And then, when I couldn't find them in the list, I couldn't turn them off. Since they are disabled by default, it's OK not to have that variable.

I've attached the catalog files for those who want to use it but don't have Bazaar.