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A remote is a very good idea for any astrophotography (STANDARD KIT YOU CAN NOT DO WITHOUT) - you simply do not want to physically touch the camera or telescope during the exposure (apart from the RA + Dec drive correctors (if guiding manually) as YOU WILL cause vibrations which the sensor will pick up as wobbling stars or objects.
There is a remote control that Canon has for their DSLRs and it is worth getting.
If you can lock up the mirror on the SLR (I am not sure if you can on a 350D or 400D) , I know you can on a 40D , then that is even better , once you are happy with your focusing.
The mirror swinging up and down can cause objectionable vibrations too.
If you can't get a remote cable release or a remote - Delayed Timer is handy.
Hope that helps.
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