Admin UI question to ponder:
Suppose a module adds a property or setting to content types: it allows you to say "content types X, Y, Z have property foo, or can do a particular thing, or do a thing in this particular way".
When should this be a UI element added to the content type admin page, and when should this be a single list of all content types?
A run-down of examples:
Added to the content type admin page: upload, comment, nodeblock, community_tags, meta tags, nodewords, content_profile
List of types: taxonomy, flag, simplenews