The Atrium Sponza Palace running in realtime in the Blender Game Engine. GLSL “HDR” Shader from martinsh (<blenderartists.org/ forum/ showthread.php?t=156482>)
I also playing around with some WebGL Frameworks for my student thesis. This is the Sponza model from Crytek in XML3D. I used the Blender Exporter from XML3D which exported fine besides the textures. It forget to add the wrap tags to the textures which i added manual.
See it here. (beware, file is 32MB big and you will need a WebGL capable browser)