A new simple time saver for Gmail users; being able to mark the bottom part of a string of emails 'unread' for quick reference in the future.
"However, if I mark the thread as unread, it will return to its previously read state without updating to show what I just read. When I come back to it, I'll have to search for the last thing I remember reading. If I star the first message I still want to read instead, I might not remember that it needs to be read when I'm in my inbox later (and when I do read it, I'll have to expand lots of messages before I can read the conversation properly).
There's a new feature in Gmail Labs that will help with this. When you enable Mark Unread From Here from the Labs tab under Settings, you'll see a new "Mark unread from here" option in the drop down menu found in the upper right-hand corner of messages.
Clicking this option on a message tells Gmail that you want that message to be the first one you see when you reopen the thread later, with all messages after it open for easy reading. So, when you leave partway through reading a long thread, figuring out where to start reading again is easy."