Hey there!
I have a few Views on my Drupal 6 site which take care of some of a node's fields.
For example, I have a content type called Country, which has a field called Capital. I've excluded this field in the node display, but there is a view that takes the node ID as an argument and displays it in the right column. This is all very pretty and has been working out well for me, but how do I take care of the node preview mode? Since the node isn't saved yet, the Capital field won't have its new value yet.
Note: I am ready to do some very dirty hacks to make this work :)