Somewhere the idea of more than one content block was discarded as being theme territory. I disagree about this, so I want to give it another try ;)
Example: I want to split the content of my posts in two parts/columns. On the left my own content, on the right some image, map or text-information from another source. I don't want to use a custom field for this because it is actual content. I also don't want to use the part after 'read more' because that's meant for something else. I can seperate the content manually by using divs or spans inside the main content area, but that's not really userfriendly. And last but not least, I don't want to loose this extra information inside a post at a later time because some plugin dies.
There is an excellent plugin with the same name as this topic title that does what I mean: Multiple Content Blocks. But like I said, it's a plugin and information would dissappear whenever this plugin would cease to function. I really think something like this should be part of the WP Core functionality. Even 'simple' blog software like Zenpage within Zenphoto has this kind of functionality built-in.