I just developed a quick BitBar plugin to show the current Steem value in your OS X menu bar.
To install it just download BitBar from https://getbitbar.com/ and then save the plugin into your BitBar's plugin folder.
Enjoy it and upvote the post if you like it! :D
UPDATE: Now it displays a cool price chart :D
Source code is available at: https://github.com/knoopx/steem-bitbar-plugin