Hi
Sorry for this delayed response - I didn't notice that people had responded.
Thinking about it again, what would be REALLY great is some kind of hook system, rather than hard coded integrations between object types.
So, instead of coding an email -> task code snippet, make a plugin architecture that allows any object -> object mapping. For example, a file format that defines the interactions through an XML file, etc.
Not being a programmer, that's as far as I can take it :-)
Regards
Brendon