Let's expand on this a bit. Since I just upgraded my Dreamweaver version, I would also like you to include information on what newer extensions include previous extensions.
For example, the Database Search extension still exists in my downloads, but I have DA2. The search extension download should include a note saying the extension was superseded by DA2 and should not be installed if DA2 is installed (or something similar). It would really be great if that information where right on the list so I would not have to click on the extension to know whether or not I need to install it.
Figuring out what is current and what is not is quite a hassle especially since one mistake can screw up your extensions.