Photoshop is a graphic software that allows you to do a host of things.
LR1 is a specialist software targeting the photographer. What does it do?
> its a RAW converter
> it can read jpeg, psd, dng and tiff
> it has a library that allows you to organise your photo files
> the develop module allows you to adjust things like exposure, saturation, vibrance, hue, WB, noise, sharpness etc. in various options
> there is a spot healing tool and a red eye removal tool
> you can prepare slideshows, webpages and print
so for me it covers about 90% what i want to do.... for the rest i need something like CS.