http://www.extractnow.com/ - opens .SIT files - make sure you download the seperate Stuffit DLL file as well.
http://www.railjonrogut.com/sdTwoWav.htm - changes SDII files to wav
Finally I merged them into stereo files in Audacity. I went through them one by one, being my first time using Audacity, and when I was done I realised that there is an option to "Export Multiple"
...anyway, it's really fast. Once you extract the .SIT, rename the files by giving them the extention ".sd2" Then get your batches going in sdTwowav and then into your Audio editor to make the L an R files into stereo where necessary...
