Thank you, Photoshop
Brian's Culture Blog had already linked to this, but I thought it was worth passing on. This fellow, Greg, has done a very creative portfolio using rollovers to show before and afters of his retouching work. Pretty amazing stuff and worth a visit. Click here.
Just pick a thumbnail and then roll over the larger image to see what it looked like before some extensive use of Photoshop tools and filters. In some cases Greg is good enough to give a short synopsis of his techniques.