Not really that is still as good/bad as .PSD is because of the nature of what the file is used for. They are both primarily containers for unfinished works and

Not really that is still as good/bad as .PSD is because of the nature of what the file is used for. They are both primarily containers for unfinished works and are designed to hold a lot of detail without so much regard for size and portability. Of course the .XCF format is open but not good enough for a simple viewer or even a web browser. Some file format based on SQLite will probably be more viable as a cross platform image format that is extensible beyond any one software developer limiting it. Kind of like HTML.