When you look at the view form for a portal list item, you can add a
web part to it using the javascript code:

javascript:MSOTlPn_ShowToolPane('2');

right in the browser's address box.

So say you've got a list item open with a "Show Title" column.

and say you've got another list of characters with a "Show Title"
column so you could imagine this one - to - many relationship:

"Shows" List:
Item#1 - Show Title : Gilligan's Island
Item#2 - Show Title : Get Smart

"Characters" list:
Item#1 - Show Title: Gilligan's Island, Character: The Skipper
Item#2 - Show Title: Gilligan's Island, Character: Ginger
Item#3 - Show Title: Gilligan's Island, Character: Lovee
Item#4 - Show Title: Get Smart, Character: 86
Item#5 - Show Title: Get Smart, Character: 99


So say you open the Shows list item and add a Characters list web
part. How nice would it be to be able to establish a web part
connection and filter the Characters list based on show title?

You could have a list item that looked like this:

Show title: Get Smart

Characters:
86
99

*Add Character

But, alas, the web part that contains the list data, which is
titled "Untitled" will not provide any connections.

Does anyone know an easy way to do this?