The law office I work for uses Dropbox. I use Dropbox in a browser profile I set aside for work instead of the local app. I just noticed today that when I upload a file, a little gray box appears in the bottom right corner of the screen showing the upload progress. When the upload is completed, the center of the box turns green and a little balloon animation appears on the left side of the box. I like the balloon animation. Nice touch, Dropbox.