One of the coolest features of the new Photomatix Pro 3.2 (one of the most popular HDR imaging programs out there) is that you can reduce chromatic aberrations. This not only a cool feature, but an important one.
In the top image, the chromatic aberration is visible along the railing. The image was processed with the old Photomatix (with a touch of Topaz adjust).
The bottom image was processed with the new Photomatix (also with a touch of Topaz Adjust). Look ma! The chromatic aberration is greatly reduced.
You can get a 15% discount on Photomatix when you use this code upon checkout: ricksammon.
If you like to play with plug-ins, check out Plugin Experience.
See the Light (and the chromatic aberrations),
P.S. If you have really nasty chromatic aberrations, best to remove them first in Photoshop/ACR or other image-editing program.