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G'day Jason
The 40d is fine for taking images.... It actually has a CMOS sensor rather than a ccd however for now that is a moot point.
The awesome planetary images you see taken are usually taken with what amounts to a specialized webcam/ video camera, the images are then arranged in a program such as registax ( free) which arranges them and calculates by averages the most accurate image.
Atmospheric turbulence commonly reffered to as "seeing" affects the image, if you look through the eyepiece you will see the moon like it is looking into a pan of almost boiling water, rippling etc. This will vary from night to night and even moment to moment depending on temperature changes, wind, upper atmospheric jet streams, topography of the area you are in etc.
With a t ring you can take images of the moon, even doing a jpg you can take 50 or more and also run them through registax to improve your end result.
Planetary photography such as taken by "bird" is at the top end and has very specialized gear to do. Have a quick search for threads started by him and have a look at his Jupiter images.
The focal length of planetary imaging is often done at 6000 mm or longer, but that does not mean you cant have a go and get some great detail with any scope, with a small scope there is probably a limit to how far you can extend that with barlows etc. Jupiter will probably only be a small dot in a small scope , but hey give it a go anyway.
Ask away with questions someone will try to fill in the blanks,
Cheers
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