Thanks to everyone for their comments.
Hi Andy - I connect the camera to the telscope using a "Canon EOS T-Ring" and a "Bintel 2'' SCT adapter". The T-Ring connects to the camera (in place of a lens) and the SCT adapter connects to the telescope. They are both available from Bintel
http://www.bintel.com.au/Astrophotog...8/catmenu.aspx
For remote imaging (i.e. controlled from the computer) I use the standard "EOS Utility" that came with the camera.