The next time you fire up Adobe Lightroom, you'll be asked if you want to download the 1.3.1 update that is primarily a bug and compatibility fix. Adobe also released Camera Raw 4.3.1 that fixes support for the Nikon D100 and the Olympus E-3. You can download both the Mac and the Windows versions of ACR from the Adobe site.
And finally, Sigma updated their Sigma Photo Pro to 2.3. This is their application for processing files captured with Sigma cameras.