I'm surprised nobody has asked for this before.
When I batch upload a gallery of images using FTP it would be really helpful if i could also batch update the title, description and keywords for the image, at the same time.
Having to manually type in 100 (ish) titles, descriptions and associated keywords is unbelievably tedious. It would be much easier to upload a text file along with the images. The text file can contain a comma separated list of filename, title, description and keywords and the keywords can be a semicolon separated list.