computed field in a block ?

By using a view you can.

Create a view, create a block.
Add an argument -> Provide default argument -> Node ID from URL
Add whatever fields you wish (use the Computed value format)
Save the view
Go to build/block/list
Configure your block to only appear at your content type. (I use pathauto, so for a story, you would enter only show this on story/*)

Hope that helps someone.

Also see CCK Blocks

Fix'd, I would think.