How can i compare the contents of two folders ?

how can i compare the contents of two folders and find out which files are in one but not in the other?? Knowing how to do this would be the best thing ever, especially when dealing with a large number of files. Often, for instance, I'm dealing with a large number of images, processing them, and saving the retouched ones to a new folder, and need to check that they are all there. If there are say three files missing in the second folder (out of say a hundred in total) being able to automate the process of elimination would be very useful. Please help!!!
B

I really wish I knew the answer to this. I work between two macs, a G5 and MacBook Pro when I'm on the go. Each time I move from one to the other I have to copy all my files to the computer I'm going to work on, so I end up with the same files being duplicated. It's not a problem if it's not much data but in my case the it can be to 30GB, mostly graphics files, photoshop, motion, final cut pro, etc.
There's has got to be a way automator can make a comparison between two folders to sort out what's changed and what's remained the same. It would be nice also if this feature could be done globally on the hard disk using spotlight's technology to stop files being duplicated in places you didn't even know about and taking up valuable disk space. I'm not sure how this could be done.
Any bright ideas Apple?

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