I've looked through some of the stuff on custom headers/footers etc but it's not exactly what I'm looking for.

What I need to do for my links directory is on certain pages include an external file, e.g. the latest news on that subject, caledars, pull of the latest forum threads etc.

Now if I was using the static build I could put <?php include("includefile.php"); ?> to bring in a file which had been put in that directory which does the necessary.

What I need is something that does that using dynamic pages, so I can include a different php (or just html) file for each category, without having to have different copies of the whole category template for each one.