*Sighs* Conventions. I've ranted elsewhere about this, and I don't feel like doing it again. Let me just utter some questions (possibly bringing this thread back from the abyss of death in the process): Why release based on height at all? Because everyone does it? What advantage does it offer over releases based on width?
Personally, I like to release at 1280px width, when the raws I work with permit it. Some of you will call overkill -- I say, take a look at US comic scans. Those guys do it right. No supposed conventions that hold them back. 1280 (that's exactly the width a large number of users on teh netz use for their desktop resolution, according to Wikipedia) for single pages, 2560 for doubles.
But it doesn't have to stay there (and it doesn't, at least not for US comics)! Scan sizes should grow as technology evolves. Who here wants to read a 1200px height Edited Manga ten years from now (mind you, your desktop resolution will probably be something like 6400*3600px by then)? Or let me rephrase that -- Who here still uses 640*480px as their desktop resolution?