Rotate multiple pictures easily in Mac OS X with Preview
Dec 4, 2009 - 4 Comments
If you have a bunch of pictures on your Mac that need rotating, open all of them into the Preview app and using the thumbnail preview pane on the right side, select all (Command+A). Now you can mass rotate all of the selected images together, using either Command+R or Command+L. Once all your images are rotated into the proper orientation, save all and accept the changes, and you’re done!

lake superior looks better upside down like that, nice tip tho preview is pretty cool
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Thanks! Awesome tip.. saved me a lot of time!
The best way to rotate is import all pictures into iPhoto.
In iPhoto, rotate pictures is native, in other words, you can easy find on the menu (photos) and rotate several at once