DelphiX has indeed changed a lot in both features, authors and status in the community over the years. It's no longer the top dog for game development with Object Pascal, but you can still use it. Check out Jaro Benes' website hosting the most current version at http://www.micrel.cz/Dx/

As an alternate, which will allow you to use Free Pascal or Lazarus, you can also look at JEDI-SDL. SDL is a 3rd party media layer and window management API that does practically all the same things as DirectX does, however it's a bit simpler to use. JEDI-SDL is simply the Pascal version of the SDL headers that allow you to use it. Check it out at http://jedi-sdl.pascalgamedevelopment.com/