People owning a HTC TyTN II have had huge issues due to the lack of a video acceleration driver - the issue has been covered to death at TamsPPC and other web sites.
The folks at htcclassaction.org have now posted videos showing a HTC TyTN II running some sort of OpenGL ES application via a driver back-ported from the Touch Diamond.
Even though no downloads are available as of now, give them a click here:
http://www.htcclassaction.org/driverprogress.php