If you like straight stuff, look up Brandi Belle. A lot of her vids are based around measuring, or include her measuring her partner. If I get some spare time tonight I'll post some links to some specific episodes.
yeah that brandibelle site is pretty cool. shes the only porno girl i see measure the guys, but she helps them out with the measurements. (like starts the ruler at the wrong point.) too bad shes not that hot.