Like Mr Merlin, I use DSLRFocus to set and automate my exposures with the 350D. I also use ImagesPlus 2.75, this software also has camera control for the 350D although not, in my opinion, as good as DSLRFocus. That said, the new Beta versions of ImagesPlus now have live focusing similar to DSLRFocus and will be implimented in the upcoming Version 2.80 release.
If you have USB 2.0 ports on your computer/laptop you might want to have a look at this site:
http://www.store.shoestringastronomy...roducts_ds.htm
I use the DSUSB and cables, DSCBL-01 and 03, or, I believe, you can use the standard Canon Timer. I also got a longer USB cable from Hap Grifin, I found the cable that came with the camera too short.
http://www.hapg.org/astrocables.htm
All in all, DSLRFocus is an excellent tool, I have had no problems using it. The next version of ImagesPlus may yet prove to be it's equal and, if that is the case, will eliminate an extra program.
Cheers
JohnG