I liked to the purchase page - here's their homepage - http://www.jpegmini.com
It's a JPG file compression for Mac and PC. You could use it to save hard drive space, or make uploads to the cloud faster (my main use)
I'm a photographer and needed to find something to shrink my file sizes. This software looks really solid and gets great reviews.
It's US$149 normally, but I found this coupon which is working still even though it appears it should have expired.
There's a trial on their site and links to lots of reviews by photographers or you can do a test by uploading an image.
I've done my own test and at 100% can see only about a 2-3% loss of quality while images are about 40% smaller.
What's the point of this? Pretty much any photo program worth its salt let's you select JPEG compression level. Also on the Mac, Preview lets you export and compress.