Dropbox - When there is a long upload time remaining, it suggests you ‘grab a snickers’.
/via John Darke
New Scientist - Simple optical illusions can make it seem like the progress bars on your file downloads are moving faster than they actually are.
Dropbox - OSX menu bar icon loading & completed states
Transmit 4 - loading bar indicates both the total transfer and per-file transfer in one progress indicator
Cloudapp - Drag and drop file to menu bar, loading icon, growl notification