ContentO ?

Page module presents it content ( like an article ) in its entirety , while story module presents that same content in a blog like fashion with teaser body. Contento does the same as Story , but as a different node. Hence , you could use a story content as a front page feed for news stories , and then contento as a seperate members news stories feed avaiable from say a members only link.

You could look at cck for adding different fields in a created node ( though it doesn't deal with teasers at all well , if at all.

ContentO module won't let you create customized data entry forms.

It can create new simple content types with only a title and a body, just like story and page, which you can use for different purposes in Drupal 4.7. (Just like Drupal 5 does by default)

If you want new content types with additional customized data entry fields you have to use CCK or flexinode.