Oh, I like this one!
I use Gmail, for lots of reasons – all related to my online professional work, and as an alternative to my work email. Integrates so well with lots of things – in my case, especially well with Google Calendar, Talk and Docs.
Here’s an extensive and very useful list of Gmail Tips, Tricks and Hacks. There are many for your to explore. Lots are new to me …… and my favourite for its simplicity and value in managing my subscriptions is the one below. Sweet!
11. Mute a conversation
Ever found yourself subscribed to a mailing list and the current conversation has nothing to do with you? If you don’t want to unsubscribe, you can easily stop the friendly spam with the Gmail mute function. Select a message in the thread and hit the m key to auto-archive all incoming messages in the conversation. The thread will stay muted until you unmute it; it will also un-mute itself if your address appears in the To or CC box.
judyoconnell.com 
Hello Judy
Thanks for the tip about this site. My favourites, now, are the switch between gmail accounts and using the drive shell. I really enjoy reading your blog every week and I would like to invite you to add yor blog details to the new International Edubloggers Directory at http://edubloggerdir.blogspot.com if you are interested.
Thanks
Patricia