A quick FYI. ImageOptim is great and I use that one all the time nearly every day. But a couple of RW users have complained quite vocally that it stripped all their copyright / EXIF data from images.
What a lot of people might not of noticed is that if you open the preferences for ImageOptim, there are a surprising quantity of settings you can adjust:
Particularly for PNG images, some of these settings can have quite a dramatic effect on optimisation speed. And this is where you can also go to tell ImageOptim if you want it to preserve your image EXIF / copyright info.
This might be of use if you have not spotted these ‘hidden’ options before.
I like DropFix too for batch resizing, naming and saving images. An oldie but goodie!