I wasn't sure if I was allowed to advertise my own related products on my own site here, but since someone already mentioned it...
Yes, I self-published a sequel to Interstellar Trader, about 8 months ago, before Shrapnel's offer came to fruition. Trader 2 adds and changes quite a bit about the game based on customer input and suggestions (and complaints, of course). More starting money, more special encounters, more combat control and more investment choices, upgraded graphics and information display/interface improvements.
Site is at:
http://www.stormcloudcreations.com
Feel free to check it out if you wish.