Natural Units (http://en.wikipedia.org/wiki/Natural_units)
Planck Units (http://en.wikipedia.org/wiki/Planck_units)
Center for Natural Units - (http://www.meer.net/~planck/unitsindex.htm)New Planck Units (http://www.meer.net/~planck/)
What is a Planck length? What is Planck time? (http://www.physlink.com/Education/AskExperts/ae281.cfm?CFID=23157161&CFTOKEN=46351742)
Most accurate measurement yet of Plank's Constant (http://www.aip.org/pnu/1998/split/pnu391-2.htm)