Chris Meloni and Elias Koteas
Jeremy Sisto and Jim Morrison
Jesse Martin and Marvin Gaye
(Martin will be starring as Marvin Gaye in the upcoming movie "Sexual Healing)
Angie Harmon and Susan Misner
(They even sound alike)
Sam Waterston and Sam the Eagle (The Muppets) It's the eyebrows.
If anyone else has some L & O look-alikes, let me know!