Lightroom: Export previews from Lightroom
One feature form Aperture that Lightroom seems to be missing is the ability to export the preview of the original raw file. In Aperture, whether your Aperture Library (equivalent to Lightroom Catalogue) is visible to the computer or not, you can simply drag and drop a photo to the desktop or wherever and it uses the jpeg preview instead of the original (on the other hand file>export>version exports the original resolution from the raw file). Lightroom gives you no option to export preview whether your connected or not. This would help me immensely because I have a small SSD in my macbook so I'd like to keep the previews on the internal SSD and the raw files in an external HDD but still be able to use the previews for web and email.