Quote - 2 quick things....
1)  Morgan Sheppard on BSG and Firefly. (As well as CSI and others)  On BSG he seemed taller than the rest of the cast, looking down on both Baltar and Apollo, Yet on Firefly he seemed short even compared to KayLee, which means either the BSG cast are strangely small or Everybody on Firefly is freakishly tall.
2)  Claudia Black, Mimi Rogers, and... Mini Driver.... seperated at birth?

SG-1 has a tall cast too, or at least the original SG-1 cast was tall.  Teal'C (forget his name) is obviously large, 6-4ish; Shanks is 6-2 I think; Anderson is around 6' if memory serves; Tapping is a tall drink at 5-9 (IIRC).