Edit multiple photos at once?

Is there any way to say adjust the brightness of a whole bunch of photos at once. Often I find that multiple images taken at the same location require the same settings, doing them one by one can be painful.

Failing that, I'd even settle for a kind of 'repeat' function. Currently I open each individual image in photoshop, in which if you hold down 'option' whilst opening various palettes, it remembers the last settings used. Anything like that in iPhoto?

Thanks for any help.