I noticed something odd on the JPEGmini homepage. They have a before/after scan over, as illustration of what the product does, but in the source it looks like they are linking to images of the similar size.

Here are the files and sizes referred to in the source:

272K preview-rolands.lakis.jpg 247K preview-rolands.lakis2.jpg 248K preview-rolands.lakis2_mini.jpg 276K preview-rolands.lakis_mini.jpg

I suppose they could have just screengrabbed both images, but that seems to defeat the point...