Working for a small project, I tried archieve the efect of emissive maps in the game engine and I liked how it looks, and write a small tutorial, with the respective blend files.
This pics show how it looks
And this video:
and the blend file, in latest versions of blender, select the object and modify the emit value of the material to 0.05, not too much, so the emit map keep visible in dark areas, in 2.49b just open it and press P, it works well (im still working in 2.49b)
And the tutorial here on my blog, hope you find this usable… thanks!