When I shoot in RAW this is what I was doing with my 350D:
I would use the USB and take the cards off the camera by plugging in the USB and just using windows to copy and paste all the photos to a folder I created. This was fine because I used Microsoft fax and picture viewer with a RAW plug in so it would work with the CR2 files just as it would jpegs.
I would just give a quick once over each pic using the NEXT button on fax and picture viewer and delete any pictures that I knew for sure weren't good.
Then I would open in photoshop to make any adjustments to WB or whatever. Then save and make my photopshop adjustments to the jpeg.
I can't seem to find a plugin for the fax viewer that will allow me use the files from teh 400D to do this the same way. I'm not good with workflow stuff here.. but what should I be using then to view the pictures one at a time using a "next" type button so I can eliminate quickly the ones that I don't want.

