The presets are used as 'develop presets". In lightroom, as you can use develop presets like 'old photo, or aged photo" to apply that look to a photo - you can also apply user made presets such as "30D correct color" that will adjust the color based on parameters set by the user when they created the develop preset in the first place.
For instance....I photographed a gretag macbeth color checker chart and then ran the ACR Script created by chromaholics.net - when all was said and done, the script gave me the correct Calibration numbers (blue hue, blue tint, green hue, green tint, red hue and red tint)....I then input these numbers into lightroom via the Calibration tab (at the bottom of the develop module) and saved this as a preset "30D Daylight Calibration"
Now upon import, I can apply this 30D Daylight calibration preset and I have perfectly correct color before I even touch a slider in Lightroom! Hope this helps 