Compression Tights--How Compression Clothing Can Help Athletic Performance
ActivSkin, and it's licensed under the Creative Commons 'share-alike' license for use by others.
As for the photo, I took it with the help of my wife (who snapped the photo of me as I was running), and modified it with PhotoShop to give the impression of movement with the blurring. It is one of my more favorite ones I did while still actively employed by ActivSkin, and I don't mind it being used elsewhere. As for the legwear, I was wearing ActivSkin A677s in black. These are full-compression, sheer hosiery with a fly opening in the front. They're very comfortable and provide good leg support.
BTW, the article linked above is a good one also. Alexis Mabury pretty much nails the reasons/benefits of compression tights for runners, cyclists, etc. She also includes references to scientific studies to lend credence to the discussion. Make sure to check it out...