We have some additional, new DST issue "stuff" coming out of Sun and IBM:

http://sunsolve.sun.com/search/document.do?assetkey=1-26-102836-1

This documents an incompatibility issue with Olson TZ Data and Sun's JDK/JREs as follows:

• JDK and JRE v1.4.2_12 and above
• JDK and JRE 5.0u8 and above
• JDK and JRE 6 and above

IBM is highlighting some problems caused under the newly patched JRE/JDKs that it supplied when an app uses a three-letter TZ name (like EST, CST, MST, etc...) rather than a full length designator (like "America/New York").  Details can be found here.