It's VH-NLH, formerly G-BNLH. Owned by BA but leased to QF untill December of this year while they upgrade their 744's. It's been used on domestic flights, HKG services, the odd flight to AKL and now seems to be on the LAX run.
I guess you've seen it during it's layover in LAX-I'm not clued up on QF TransPacific operations but hopefully one of our Aussie members will give you a little more detail.
you can't buy time but you can sell your soul and the closest thing to heaven is to rock'n'roll