It's actually pretty amazing how much they do.
http://demo.fb.se/e/girlpower/retouch/retouch/index.html
http://homepage.mac.com/gapodaca/digital/bikini/index.html
http://www.fluideffect.com/
Hey, I want to send them a picture of me, so I can see what I would look like "retouched"! Second link was pretty cool.