For example, a title field could be in the a form, and on the page. It could be edited inline on the page or edited in the sidebar.
Another example, merge blocks and inline blocks. You can either rearrange blocks in the left sidebar form, or rearrange them inline on the page. Enter into the block by clicking the edit button in the overlay menu or in the sidebar by clicking the block item in the blocks field.
Changes to the page would show up in the sidebar and changes made in the sidebar would be reflected on the page whether it is inline or not.
need to really be different than this?
I believe these two paradigms could be merged making the overall API simpler, easier to use and understand.