Sorry to dig up older threads but I just wanted to thank indigorising for the resources links and I've doled out a rep I already had the physical geography one and had searched to see if it had already been posted otherwise I was going to post it.

Also thanks to Greason Wolfe for the WBM link - I've actually saved those pages in case they disappear. I saw a Stargen link that didn't work but I googled and found this:
http://www.eldacur.com/~brons/NerdCo...n/StarGen.html

If you don't want to or can't download the software there's what looks like a web version at http://fast-times.eldacur.com/StarGen/RunStarGen.html

There's an interesting piece on the planet building page (follow the breadcrumb back from the Climates to Creating Planets link) about binary stars and how planets orbiting them wouldn't be very habitable. I may attempt to memorise the mathematics behind it and bring it up next time I see a sci-fi film with two suns Pedantry is a right not a privilege