Hi Dan,
I have a Canon 1000d and use Canon's EOS Utility for camera control. Comes with your camera for free. Works fine, can set everything and control everything directly from your PC via USB, including multiframe exposures ie 10x 5min shots. Liveview via your PC makes focusing a snap on a large screen.
In not discounting Backyard EOS as a good tool, but look at what is included with your camera then decided if you need to do more with something else.
Dont forget an external power source for your camera. The batteries dont work so good the closer you get to 0 deg celsius. Have heard many a story of people having to swap batteries every few frames and put batteries on the heater to keep going. With external power you also dont have to worry about running out of battery mid session.
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