Crops, simple cloning, vignettes, contrast, levels, noise, grad filters.... possibilities are endless! There are loads of automated tasks which also do the job nicely without having to put too much effort in.
I also use it to handle batch processes like exporting to Flickr, it is also the perfect tool to use for your catalogue. I used to use Canon Photozoom but LR is a lot nicer to use with thousands upon thousands of images.
It also makes use of dual screens which is a bonus, you work on one while seeing the image in full size in the screen next to you.