Thanks! Last night the moths were all over my datura plant so I had to get some shots. I used a Canon 550EX flash pointed upwards, and held a piece of paper above that to reflect the light down onto the subject.
It's either a 5 spotted Hawk Moth or a Carolina Sphinx - both are referred to as Hornworm moths, the former Tobacco Hornworm, the latter, Tomato Hornworm Moth.