Only a small post, but I just signed in to Google Mail and received a loading bar progress indicator.

No need to stop the press, but it's a whole lot more useful than the old "Loading..." message.

I hope they do the same with file attachment uploads as well. Progress indicators are a much more user friendly display of loading times than just a spinning icon, or as previously on Google Mail, writing "Loading...".

Hint: Always aim to explain to your users the progress of whatever operation they are waiting for. Progress bars are a simple and efficient way of doing so.