Hi Steve, welcome on-board... I'm not sure how much success you'll have with your SX1 IS and a telescope - you'll be able to do eyepiece projection, where you literally photograph the view through the eyepiece, but this can have variable results. Most people use DSLRs, remove the lenses and physically mount the camera on the scope like a big lens - see:
http://www.cameralabs.com/reviews/Canon ... aphy.shtml
Your SX1 IS does however have a nice big lens and a smart teleconverter option when filming video which lets you grab some nice views of the Moon - you'll just need to underexpose a bit because the Moon is a lot brighter than it looks. You can see an example in my video tour:
http://www.cameralabs.com/reviews/Canon ... view.shtml