Delphi 2005 has a C# compiler and it can use both delphi and C in a program. I don't really know that much about Delphi 2005 since I have only gotten it a few months ago before which I was using Delphi 5 (there are BIG changes!).
Anyone with experience of the package please could you give me help.
You can always translate the header files, and use the dll . I don't really recommend making 3D games in Delphi though. Delphi code is quite slow compared to C++, and if you already know Delphi and it's secrets, it shouldn't take long to learn C++.
Will Dev C++ be fine for my purposes? If so, I would be very grateful if you would direct me to a tutorial, I know quite a few of the commands, but I will need to be comfortable with the language.
Devc is officially supported and works nice with the engine. The only thing is that it natively only supports OpenGL; if you want to do some DX stuff there's some tweaking around to do but there are several tuts here on that topic.
But you support a compiler that was written in delphi? I think someone is slightly misinformed here
there is almost no speed differnces between compilers. Any slowdown as always is on the part of the coder and you should never blame your tools
But yea Delphi support is claimed for irrlicht but ive yet to see any evidence of this and if you include the irrlicht.net DLL in Delphi .net you get strange errors from it.