If you are a fan of Evernote, an update is on the way. The developer claims over 100 features have been added and Evernote for the Mac has been completely redesigned. You can read more here.
As to the Mac version, you can read and see more features described here.
Some of the new features include a left sidebar, the ability to browse and create notes from various notebooks, a grid view, an atlas showing you where your notes were created, smarter searching and collaboration.