One of my biggest problems with Apple Mail (or GMail in the past) has been the inability to keep mail as unread until I'm ready to act on it. It's probably not the greatest GTD strategy to keep mail marked as "unread" in my inbox until I'm ready to process or address it, but I picked up the habit years ago as an Outlook and then Thunderbird user. I'm not sure if GMail ever remedied the issue with a Labs feature, but after a bit of googling-out-of-frustration today I found the Apple Mail plugin TruePreview from Christian Serving, LLC. It's free, quick, easy and works. After trying out a number of other hacks, I was so happy to come across this today and had to share in case there are any other wacko's out there who prefer to keep mail new until it's time to act.