Louisa:
This is a great introduction to the power of gmail. I am a big fan of keeping the inbox empty. I agree with you that it helps to keep from feeling overwhelmed. Thanks for making the video. Another great tool to consider are google labs. In addition to using the recommendations you have provided, I use the lab by Vivi called Multiple Inboxes. This allows me to see my unread email in a list different from my inbox but on the front page of gmail. This way I can, at a glance, see what is new and decide what to process (once or twice a day).
Keep creating these tips! We all need to be reminded of them.
Thanks
~Linda DeLuca, Executive Coach www.azione-scopo.com