Camera Raw 5.7 update
This new version of the Camera Raw plug-in replaces the original one that was installed with Adobe® Photoshop® CS4, Adobe Photoshop Elements 8 and Adobe Premiere® Elements 8 software. Visit the Camera Raw page for a complete list of supported cameras (includes support for the Canon EOS Rebel T2i / 550D).
Lightroom 2.7 update
The Adobe Photoshop Lightroom® 2.7 update includes these enhancements:
Additional camera support for several new camera models including the Canon EOS 550D, Panasonic G2 and Sony A450
Includes corrections for issues introduced by previous Lightroom 2 releases