As you know, DST (Daylight Saving Time) changes in the US this year according to the Energy Policy Act of 2005. Therefore Java/JRE timezone data should be updated to recent data because it has own timezone data. Sun provides the tzupdater tool which allows you to update only JDK/JRE timezone data leaving other configuration unchanged.
If you use the following JDK/JRE version or later, you don't have to make any changes.
The tzupdater tool requires that the version of JDK/JRE is 1.4 or later and the value of the "java.vendor" property must be "Sun Microsystems, Inc".
Of course, you don't forget to apply OS patches on US2007DST :-)