Super Dimension Century Orguss is noteworthy in that it apparently inspired the "resolution" to the DC comics multiverse, as depicted in Crisis on Infinite Earths. The conflict in both Orguss and the DC Crisis was driven by the instability of The Multiverse — DC by inter-universal conflicts, Orguss by the inherent dangers of a patchwork world. Both were resolved by not only erasing the world as its inhabitants know it, but also erasing all knowledge of the cataclysmic world.
No Export for You: The original series, but not Orguss 02, in the UK. It got released Stateside, however, but apparently only the first 17 episodes until Discotek got the rights to it.
What Could Have Been: Carl Macek had originally intended Super Dimension Century Orguss on being the second Robotech series (and Southern Cross as the third), since it was the second in the the "Super Dimension Trilogy" that started with Super Dimension Fortress Macross and ended with Super Dimension Cavalry Southern Cross. All three shows were un-related in story, but all were from the same studio, and shared many production team members and story concepts. When he couldn't secure the license to Orguss, Southern Cross was moved up to being the second series, and Tatsunoko's Mospeada was chosen for the third.