Looks like it is time to upgrade GWT again. Version 2.4 of GWT is now available. See the release notes below:
'via Blog this'
http://dl.google.com/eclipse/plugin/3.3
http://dl.google.com/eclipse/plugin/3.4
C:\Program Files\gwt-windows-1.5.3>applicationCreator.cmd -eclipse MyGWTProject -out c:\MyGWTProject com.mynumnum.client.MyClass
Created directory c:\MyGWTProject\src
Created directory c:\MyGWTProject\src\com\mynumnum
Created directory c:\MyGWTProject\src\com\mynumnum\client
Created directory c:\MyGWTProject\src\com\mynumnum\public
Created file c:\MyGWTProject\src\com\mynumnum\MyClass.gwt.xml
Created file c:\MyGWTProject\src\com\mynumnum\public\MyClass.html
Created file c:\MyGWTProject\src\com\mynumnum\public\MyClass.css
Created file c:\MyGWTProject\src\com\mynumnum\client\MyClass.java
Created file c:\MyGWTProject\MyClass.launchCreated file c:\MyGWTProject\MyClass-shell.cmd
Created file c:\MyGWTProject\MyClass-compile.cmd
C:\Program Files\gwt-windows-1.5.3>projectCreator.cmd -eclipse MyGWTProject -out c:\MyGWTProject
Created directory c:\MyGWTProject\test
Created file c:\MyGWTProject\.project
Created file c:\MyGWTProject\.classpath
C:\Program Files\gwt-windows-1.6.0>webAppCreator.cmd -out c:\MyGWT16Project com.
mynumnum.MyClass
Created directory c:\MyGWT16Project\src
Created directory c:\MyGWT16Project\war
Created directory c:\MyGWT16Project\war\WEB-INFCreated directory c:\MyGWT16Project\src\com\mynumnum
Created directory c:\MyGWT16Project\src\com\mynumnum\client
Created directory c:\MyGWT16Project\src\com\mynumnum\server
Created file c:\MyGWT16Project\src\com\mynumnum\MyClass.gwt.xml
Created file c:\MyGWT16Project\war\MyClass.html
Created file c:\MyGWT16Project\war\MyClass.cssCreated file c:\MyGWT16Project\war\WEB-INF\web.xml
Created file c:\MyGWT16Project\src\com\mynumnum\client\MyClass.java
Created file c:\MyGWT16Project\src\com\mynumnum\client\EchoService.java
Created file c:\MyGWT16Project\src\com\mynumnum\client\EchoServiceAsync.java
Created file c:\MyGWT16Project\src\com\mynumnum\server\EchoServiceImpl.java
Created file c:\MyGWT16Project\build.xml
Created file c:\MyGWT16Project\.projectCreated file c:\MyGWT16Project\.classpath
Created file c:\MyGWT16Project\MyClass.launch
2009-02-13 12:22:51.760::INFO: Logging to STDERR via org.mortbay.log.StdErrLog
2009-02-13 12:22:51.901::INFO: jetty-6.1.x
2009-02-13 12:22:52.229::WARN: failed echoServlet
java.lang.NoClassDefFoundError: com/google/gwt/user/client/rpc/RemoteService
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)