Hot on the heels of the Evernote 4.0 for windows release, there's a great Evernote Beta for Mac. You have to check the 'update to beta versions' in the preferences to get it, but I have to say it's a nice upgrade.

Perks include a new easy to use management of shared folders, stacking notebooks for better organization, and other UI tweaks especially in the left hand panel. Note that this is a beta so if you're really worried about your data, read the warnings and take heed, and maybe wait for the official public release. I had no issues with the upgrade for my 614 notes however.