I use Lightroom to import my pictures and put them in a folder named the location and the date of the shoot.
Then I usually just go through them all and delete complete junk (blurred, badly under or overexposed, something got in the way of what I intended to capture etc.).
After that I start to go through and edit, firstly the exposure then color using Lightroom and then finish it off with CS3. I just right click (CTRL-click depending on what computer I am using) and edit so that it will save the edited image and I can compare before/after and stack the images on top of each other.
I love Lightroom by the way, probably 85% of my PP work is done there. With maybe sharpening, skin smoothing and couple other random things in CS3. I even print directly from LR.