Adobe Lens Profile Creator
Adobe has released a prerelease of the Adobe Lens Profile Creator to Adobe Labs. This is a free utility which allows for the easy creation of Lens Profiles which can be used in Photoshop CS5, Lightroom 3.0 (full release) and Adobe Camera Raw.
These Lens profiles can correct for lens aberrations; geometric distortion, lateral chromatic aberration and vignetting.
Try it out at Adobe Labs then share your feedback on the Lens Profile Creator forum.