Adobe have released an update for LightRoom 2 which changes the version to V2.4
Enhancements include:
• Additional camera support for several new camera models including the Nikon D5000 and Canon EOS 500D (Digital Rebel T1i)
• Several corrections for issues introduced by previous Lightroom 2 releases
• Web galleries with a Collection Title of six characters would not export or upload
• The crop aspect ratio could revert to the last selected ratio even when reset to original
• The crop aspect ratio in Quick Develop could be lost after a crop adjustment
• The crop aspect ratio lock could be lost after an orientation switch
• Images could preview incorrectly when imported using the MTP/PTP USB protocol
• Sony .ARW files may not have been recognized by Lightroom’s import dialog
• The Japanese language configuration of Lightroom on Mac OS X 10.5 could fail to switch to the print module if the HP B9180 was set as the default printer
• Metadata options that are intended for use were dimmed incorrectly when exporting DNG files
• The Japanese language configuration of Lightroom on Mac OS X was missing a shortcut for “Zoom Out”
• Several translation and shortcut corrections were made for the eight additional languages introduced with Lightroom 2.3
You can find the Adobe updates here http://www.adobe.com/support/downloads/new.jsp