While Google Maps rocks, GMail is less than intuitive sometimes.
I have my incoming mail sorted so the newest stuff is at the top. No big deal. Most mail programs in the last ten years have let you sort ascending or descending by date.
Now, if an email comes in that's part of a threaded discussion, the web interface to GMail puts the thread as the first thing in the mailbox, but then shows the thread with the oldest message in the thread at the top. The net result to me is that I printed out four drawings that I thought were brand spankin' new that I had really printed out two or three weeks ago.