Cth has just submitted a Direct3D9 compatible render system, and this is now in CVS. It’s still experimental at this stage, but do have a look if you’re interested.
I have not added it to the default Ogre.sln and Ogre.dsw projects yet, because I know that not everyone has obtained the DirectX 9 SDK yet. If you have and you want to play with it, simply add the project to your workspace, the project is in ogrenew\RenderSystems\Direct3D9\scripts\. Remember also to add RenderSystem_Direct3D9.dll to your plugins.cfg.