There is an article by Peter Laman on the topic Making “Stay-on-top-forms” do want you want on the Embarcadero blog. It’s from 2004 and of course the link to the component he talks about no longer works, because it points to cc.borland.com which no longer exists.
Here is a working link.
(I don’t know whether the component still works or is even reqired. I just encountered a problem with a stay on top form and found this article.)
Edit: It’s not a component but a class TStayOnTopForm derived from TForm. You are supposed to derive your form from this class and it does everything else for you. Unfortunately it doesn’t seem to work in my test program, but it does work in the demo that comes with it.