Apple has released Mac OS X 10.4.1.

The 10.4.1 Update delivers overall improved reliability for Mac OS X v10.4 and is recommended for all users. It includes improvements for:

• file sharing using AFP and SMB/CIFS network file services
  using DHCP in wireless networks
• user login when accessing LDAP and Active Directory servers
• core graphics including updated ATI and NVIDIA graphics drivers
  synchronization with .Mac
• Address Book, iCal, Font Book, Mail, and Preview applications
• Dashboard widgets: Address Book, Flight Tracker, Phone Book, and World Clock
• creating and burning disk images using Disk Utility
• compatibility with third party applications and devices

For detailed information on this Update, please visit this website: http://www.info.apple.com/kbnum/n301517

UPDATE: MacDailyNews reports that the Dashboard vulnerability has been rectified. I can confirm this.