Actually, I have Asphyre-compatible OpenGL code, which was initially made long time ago for Asphyre Pro (but was never released). It only needs to be slightly modified to work with Asphyre Casual.

The reason behind the delay for additional service providers is that many components must be designed in a DX7 way (a bit rubbish I must add, but works nevertheless). There will be most likely provider for DX 8.0 as well (it is a matter of 30 minutes writing it), in addition to DX9.0 and OpenGL.