yes, but I hear rumors about OpenGL will be converted to Direct3D in Windows Vista.
That doesn't make any whatsoever sense.
DirectX is an API, a programing interface that allows the usage of a variety of hardware with the same instruction set. Namely you order the program to draw things, make sounds, network in a manner you specified, but actual implementation with all the hardware idiosyncracies is left to the DirectX.
OpenGl is pretty much the same, but for graphics only. Unlike DirectX it's opensource, and will run on non-Windows machines.
OpenAl is the opensource, sound equivalent of OpenGl.
You can't convert one into the other as they have different standards and instruction sets, hence the reason why graphic cards use different drivers for OpenGl and Direct3D.
Right now as far as I see it, Microsoft tries to pull the same **** they did with windows-95 and Internet Explorer: bundling the OS with their own ****, and through sheer market dominance, expelling the other standards from the consumers PC.
In other words dominating your electronic environment even more by gaining a further monopoly.