No, I certainly agree that cross-platform compatibility is important (the D3D10 implementation I mentioned in my post was for WinXP, OS X, and Linux, and spawne

No, I certainly agree that cross-platform compatibility is important (the D3D10 implementation I mentioned in my post was for WinXP, OS X, and Linux, and spawned from a reimplementation of Win32 on OS X/Linux), but this has to be weighed against the costs. Going with OpenGL, SDL, OpenAL, etc is certainly not the easy route, even with the huge benefits, and for small dev houses it can easily become overwhelming. If your code needs to be cross platform, then OpenGL (or both, but that again is more expensive) is the only way to go. If cross-platform compatibility would simply be icing on the cake, then you need to weigh the development costs of both approaches.