Hi Carl
I've seen lods of people asking for multiple post content fields which makes it easy to collect the specific data from the users. I happen to come across one such plugin
http://wordpress.org/extend/plugins/multiple-content-blocks/
This plugin enbles the wp admin post interface to have multiple content blocks and with only one change in the theme this works.
Do you see a possibility of using these features within the post block where by doning small changes in theme file this funcationality can be achieved.
Regards
Nitin