Latest news from The National Archives is on the 30th April they will switch off their old catalogue, and 'Discovery' will become the only way to search TNA collections. The Catalogue was a groundbreaking tool when first launched over a decade ago. However, the TNA reached the point where it was no longer practical or cost-effective to maintain or update it, and started work three years ago on building a new catalogue: Discovery. Both catalogues were kept operational to allow users to get to grips with the new version. However, TNA has now said due to budget cuts it can no longer maintain two systems so the old catalogue is to be switched off on the 30th April and Discovery will be the only way to search the vast collections. There's more information here. Which system do you prefer? A number of family historians have not been that impressed with the new Discovery catalogue system and preferred the old one!