November 27, 2010
P.S: List is not exhaustive. There cannot possibly be an exhaustive list.
Cracked by: krudebox , jowens , Pawankumar Hegde , Ananth , Rogi , Manish Achuth , shrik , v.chandrashekar , mankuTimma , Dibyo , Shwetha Maiya , Sumanth Patlolla , Raghuvansh , apar , dineshk , Sud , SS , username , Rahulk , bluegem4 and udupendra
Logarithmic spiral. They all are log spirals.