Croissanga is a WordPress plugin that gives you the ability to add, edit, and delete your Xanga posts directly from WordPress.
Croissanga version 1.1 was written for WordPress 1.2. It is not compatible with all of WordPress 1.5's features.
Croissanga version 1.2 was written for WordPress 1.5. It is not backwards compatible with WordPress 1.2.
Croissanga version 1.3 was written for WordPress 2.2.2. I am not aware of its backwards compatibility; earlier WordPress versions have security issues.