Pojo - When uploading an image, the picture is shown immediately with an upload progress overlay.
Flickr - The favicon turns into a live indicator showing the progress of the upload.
Flickr — When uploading files, it shows percentage in the tab, so you can always see the load progress while surfing other sites.
Chrome - After clicking on an active download, the status changes to “Opening in [time remaining]”.
/via John MacAdam
Mac App Store - While downloading a new app, the icon transparency changes according to the progress of the download.
/via Florent Gosselin
Mac App Store - The progress bar of installing an app from the Mac App Store changes its dimension separate from the icon, when magnified in the dock.
New Scientist - Simple optical illusions can make it seem like the progress bars on your file downloads are moving faster than they actually are.
Instapaper - Lenght and progress indicator
Transmit 4 - loading bar indicates both the total transfer and per-file transfer in one progress indicator