The UI is coming along nicely (I need to work out how to do animated gifs to show stuff off). It’s widget based with a good input handling system, I just need to work on using several textured quads so that the windows can be styled nicely.
I’ve also done a bit of work with post-processing effect shaders to produce a glow on the more luminous areas. Here’s a couple of screenshots showing the sun from the perspective of an Earth and the result of the reflection of sunlight over the desert (it’s not quite right over the ocean yet, so still need to work on that).
I saw in GPU Gems 2 a really cool look to do the atmosphere. Originally I was just going to do like a transparent sphere, but I think that effect looks a lot cooler; O’Neils Atmospheric Scattering.