That URL made me grin. I lived in Jo'burg for about 6 months, and loved it. (Actually Sandton and Kempton Park. Kinda the same, right?) I am actually listening to 5fm over the net right now.
Where do you live in SA?
Anyway, I also encourage you to open your source. You will still own your project, but others may learn from it. Also, you may get many patches and suggestions from others. Everyone I have seen with an open source project learns a lot from many teachers all over the world.
Also, for your forum link, why not point here? A single point of contact for this would be good.