Houston (IAH, HOU and EFD) has several good places for spotters and photography, including a few provided by Houston Airport System.
They're described very well here
HoustonSpotters.net
Also, from my days at DHL, I believe the mildly derogatory term "Ladderman" was used for spotters at LHR, as a ladder was used to defeat the plastic sheeting they attatched to the perimeter fence to prevent vehicle drivers going "Cool! A 747....<crunch of steel>"
Does anyone know if the United Club in Terminal E at IAH has any views of ops?