The ability to open multiple files from Lightroom into Photoshop as Smart Objects and place them into a single document saves a significant amount of time when compositing. The only restriction is that you must first open a document in Photoshop. Since I typically work with a blank canvas to begin with, this requirement doesn’t bother me. Once you have your Photoshop document open, select the images in Lightroom (yes, you will have to be in Normal screen mode in Lightroom to do this) and drag and drop them on top of the open Photoshop document. Each image will be placed one at a time – displaying transformation handles for resizing to the desired size upon placement.
As you can see, all of the files are also automatically converted to smart objects as they are placed and the layer name takes on the original document’s name. Sweet!
Note: the options to “Resize Image During Place” as well as “Place or Drag Raster Images as Smart Object” are controlled in Photoshop’s General Preferences.
Update: Sorry, I think this is a Mac-only feature. If you know of a way to do this on Windows, please share!