Hi Dennis,
nice image even though it is lacking a lot of red channel data.
But as mentioned by Gary, the Canon DSLR's have a 'low pass' filter across the ccd chip that prevents much of the IR light.
This prevents over saturating of the chip in the red channel for balanced terrestrial photos.
You can actually remove this filter permanently which is just what's needed for astro images and when you're wanting to take happy snaps/ terrestrial, there's a screw on IR filter with the same band pass you can buy to fit the Canon lens' directly to the front.
If you seriously thinking of using the Canon for astro imaging, it might be a good cheap option for the best of both worlds.
Here's a link that might help.
http://astro.ai-software.com/article.../mod_350D.html
Also try Steve Canistra's site for a good description on processing DSLR images.
http://www.starrywonders.com/
Rich