Thank you everyone. Your suggestions have been extremely helpful. I've gone to using the 24-55 lens for macro work and have even started to get the hang of using the 18-200. I backed it off to somewhere below 135mm and pix of the bird feeder seem a lot sharper.
Oh, and one other thing if found today is that for macro, a tripod is a must. I shot a lot of pix and found that due to the almost nonexistant deapth of field, even at f/11, my body motion when in an awkward position can move the focused subject outside the deapth of field and blow a really good shot.