Lifehacker has put together a list of what they call the "top 10 secret features of Mountain Lion." That's not quite right -- these features aren't secret, because it would be pretty silly to release an OS update and not tell anyone about it. But they are subtle, and this is a nice list of features you may not have noticed yet.
For example, the fact that you can tweet right from the top of Notification Center, or that you can share photos straight from QuickLook using the Share button. You can also rename files in TextEdit (or share them to iCloud) just by clicking on the
