PTLens
PTLens is software that corrects lens pincushion/barrel distortion, vignetting, chromatic aberration, and perspective. The following are supported:
* PC (Windows 2000 or later, screen resolution at least 1024x768 DPI 96)
o Standalone application (JPEG, TIFF)
o Plug-in for Photoshop
o External editor for Lightroom
o For further instructions view file README.TXT in the download
* Mac (MacIntel OS-X 10.5.2 or later, screen resolution at least 1280x800)
o Standalone application (JPEG, TIFF, Raw)
o Plug-in for Photoshop (no Rosetta)
o External editor for Lightroom (version 2.0 or later)
o Plug-in for Aperture (version 2.1 or later)
o For further instructions view file ReadMe.rtf in the download
View examples of PTLens at work, or download the software for a free 10 image trial
here.
I believe the software works with Lightroom and Aperture.