Looks like OpenGL ES is an option.

If I were to develop a 3D app that I wanted to port to the 3 major touchscreen mobile operating systems, what language should I choose so that it's easily portable? I've developed many apps on WinMo, and have just built a hello world app for Android. Is there anything that will work on all 3 platforms with minimal modification? Thanks!

I'm very new to audio. I stumbled across the following code and I'm using the it to play audio .mp3s in my DX9.0 app. ( Nov 08 SDK )

::CoInitialize(NULL);
CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC, IID_IGraphBuilder, (void **)&g_pGraphBuilder);
g_pGraphBuilder->QueryInterface(IID_IMediaControl, (void **)&g_pMediaControl);
g_pGraphBuilder->AddSourceFilter(L"../Media/Audio/Music/Artifact_CharMain.mp3", L"../Media/Audio/Music/Artifact_CharMain.mp3", &pSource);
pSource->FindPin(L"Output", &pPin);
g_pGraphBuilder->Render(pPin);
pPin->Release();
g_pMediaControl->Run();

How can I make the .mp3 loop? Thanks!