[development] node type without a title?

[Jeff Eaton]

A node's nid is its unique identifier. Period. End of story. Forcing 
titles to be unique is a mistake -- and forcing users to enter titles 
all the time is also a mistake. Arguably, in the admin section we should 
display nid in addition to title. Perhaps we should theme the node title 
to read <untitled> if there's no value there. But forcing them to be 
unique is definitely broken. In *some applications* some types of nodes 
should have unique titles, but that's about as far as I'd go.

--Jeff