Apple has released several updates for Mac OS X 10.4, including fixes for Mail, Safari, Address Book, iSync and Widgets. Details are as follows:

-Mail no longer quits or stops responding unexpectedly if third-party Mail extensions have been installed.
-Safari no longer unexpectedly quits when control-clicking (or right-clicking with a multi-button mouse) some kinds of PDFs or graphics within a Safari window.
-Dashboard has been enhanced, with new updates for address Book, Flight Tracker, Phone Book and World Clock widgets and improved widget compatibility.
-iSync now supports the Motorola V180.
-Several DHCP wireless networking issues have been resolved.

You can download the new software updates here.