Shrinkray can optimize up to 50 images at the same time, so your files can be shrunk down to size in no time at all.
If you can click on a button, you can optimize your images. No messing around with clunky command line tools or terrible web interfaces. Just sign in, and start shrinking!
Shrinkray adds comments to the Github pull request telling you how much space you've saved. Show off pretty graphs right on Shrinkray too!