You mean like when Theo has chipped the keeper or taken it with his left foot? Henry came here and has said himself that he had to relearn how to become a striker. He wasn't that confident on his left foot and he was never any good in the air. The Barca miss in the final is a prime example, if that had been on the right, I'd have been confident he'd finish, but on the left, he was never that confident. He could score from that side, but he was never as consistent on that foot or side compared to the right.
It's the same for RVP. On his left foot, you see the confidence but only over the past few seasons, he's started using his 'chocolate' leg and you'd never see him lace one in with his right like how he does with his left.
http://www.youtube.com/watch?v=bTebxpuryvI
Here is Henry's goal compilation. A great variety of goals like you said, but the bulk are from him wrapping them around the keeper with his right foot. Even the belted shots. Wenger should be playing Theo down that same left hand side so he can drift in.