The Dell Axim 50v has a Imgtech display controller(I believe). I'm wondering if games exist specifically for this hardware, and what development tools exist to make use of it.
Kristof may be the person to ask but, FWIW, there are (public) development tools for MBX, using OpenGL ES, and also a PC OpenGL ES Emulator on the PowerVR Developer website.
Dell Home includes 2 accelerated games with the Axim X50v, Stuntcar Extreme and Enigmo. The Dell Small Business site includes a demo of Enigmo.
Besides those two games, I know of an independently developed one that's under construction called Solterra. It's an on-rails 3D shooter in the vein of Starfox.