I wrote the Attached Node module a while back:
http://drupal.org/node/11988

It basically uses filters to substitute [node:123] with the contents of the node.  It also has image-specific code (for Drupal 4.5) that allows for manipulation of the rendering:

     [node:123,res="640x480"]
     [node:123,res="original",title="Original version of the picture"]

A coworker wrote a custom UI in my project to insert the node tag content from a select list, but others feel comfortable just typing these tags in directly.
This code has not been touched in 20 months.  Feel free to update it to Drupal 4.6 or 4.7.

-Mark

Carl Mc Dade wrote:

Yes, I have decided to use an association table and nodeapi. I'm a bit hung though because I forgot to ask for a complete business model. I am unsure about "whom" is going to be the end user of such a capability, bloggers? admin? forum moderators? Or should it be open to all and subject to moderation. Once I get these out of the way then I will start in.

I appreciate all the input and you can keep it coming. But the one thing that is missing in the responses is the main question. Frequently after someone tries to make a contribution they are stopped because their project is similar or the same as another ongoing project. To avoid this collision I thought to ask if anyone has a project that is even remotely like this?


*/Suuch Solutions <drupal@suuch.com>/* wrote:

    I've done something similar that essentially redirects all
    comments to a non-forum node to an assigned forum node. Yes, it's
    a matter of hook_nodeapi, a table to keep track of associations,
    and hook_link. Post count ( e.g. 1 comment, 2 comments) is already
    handled by the comment.module once you know the associated forum
    topic nid.
         I can send you code snippets if this description is not enough.
    paa.kwesi
         On 12/08/06, *Jeff Eaton* <jeff@viapositiva.net
    <mailto:jeff@viapositiva.net>> wrote:

        A site I've been working on has almost *exactly* the same
        requirement. It's still in development, so the code doesn't
        exist yet (urgh), but our conclusion was:
                 Use nodeapi's insert $op to intercept new blog posts. When
        they're saved, programmatically create a forum post with the
        blog post's teaser and a link pointing to the 'full' blog
        entry. In nodapi's 'view' $op, add a link at the bottom of the
        blog post to 'discuss this post' that points to the forum
        topic in question. It would work best when blog posts have
        comments disabled; that way there's only one place to discuss
        a given blog post. The end result is that blog posts point to
        the forum for discussion. It would probably work best if there
        was a dedicated forum category for those types of posts.
                 I'm not sure if that's helpful, but it's the flow we came up
        with. There's some sample code for programmatically creating
        forum nodes in the 'devel' module's generate-content.php
        script. It handles the proper linking of taxonomies and
        updating of post counts, etc.
                 --Jeff

            -----Original Message-----
            *From:* Carl Mc Dade [mailto: carl_mcdade@yahoo.com
            <mailto:carl_mcdade@yahoo.com>]
            *Sent:* Saturday, August 12, 2006 11:29 AM
            *To:* development@drupal.org <mailto:development@drupal.org>
            *Subject:* Re: [development] Nodes content within nodes
            solution developement?

            That type of solution is a bit too complicated to set up
            and administrate.

            What we are looking at is a integration of two types of
            community user. The blogger and the forum user. A blogger
            consistently writes on topics but may not do so in a way
            that it sparks a forum. They may be just blah blahing. But
            sometimes they may blog on a topic that fits in with a
            Forum category. In this case we would like the user to be
            able to take a blog and insert it inline into the first
            post. This is so that comments and replies land in the
            right venue. Also the blogger or site administrator does
            not have moderate blog comments and replies this is left
            up to the moderators of the Forum.




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