Here are the new features from the Cambridge Audio software update:

Improved networking capabilities:
The 640H can now be easily seen and accessed on a home PC network. This offers increased stability and network accessibility when changes are made to the 640H’s hard drive content. It is now much easier for networks and PC’s to recognise and scan the 640H and register it as an external storage device.

Audio content can be easily assigned onto the 640H from a PC or network by simply ‘dragging and dropping’. This also allows Album Art to be easily transferred, and content which was recorded to the drive without album art can now have artwork added to it at a later date.

Greatly improved user interface:
It is now possible to scan backwards and forwards up to 32x normal speed through individual tracks to locate a particular point in a song or performance.

The timer now counts up, as a normal Cd player would, indicating progress through a track, as opposed to the previous counter, which counted down to the end of the track.

The improved shuffle facility allows the user to enjoy random playback of all content, or if they prefer, random playback of tracks of a specific Genre or Artist. For example, selecting ‘Beatles’ in artists and then ‘Shuffle’, allows you to listen to random tracks from any Beatles album stored on the hard drive. Similarly, selecting a genre such as ‘Classical’ and then ‘Shuffle’ would allow you to listen to all tracks stored as classical genre in a random order.

AAC handling:
Enhanced stability with the storage and playback capability of AAC files. Previously, some unrelated data contained within AAC files may have caused stability issues. Now, the 640H can store and handle AAC files without issue.

Improved stability of Hard Drive:
The latest software version offers greatly improved stability, reliability and consistency when large amounts of content are placed on the drive. This resolves any previous issues that users may have had with hard drive integrity when they were approaching full capacity.

Pocket PC control:
The upgraded software allows a 640H to be remotely viewed and controlled by a Pocket PC, allowing users more comprehensive remote access than that provided by the standard remote control. This greatly enhances the functionality of the unit in the context of full home automation.

Source: Here