Last night Adobe released the updates for Lightroom 3.3 and Camera Raw 6.3. If you have earlier versions already installed, you can update them using the internal update mechanism, or you can download them here.
These releases add new lens profiles, raw support for new camera models and a number of perfromance improvements and bug fixes. The updates are recommended for all photographers using the software.
Adobe has also released a new Lens Profile Downloader that allows you to install profiles for a wide range of SLR lenses. Lens profiles correct distortion, vignetting and chromatic aberration specifically for the lens used to make the capture. For more on lens profiles and to get the downloader visit Adobe Labs.
For a full list of all the improvements offered in this upgrade click here.