Google plugin for Eclipse(http://code.google.com/intl/tr-TR/eclipse/) both supports supports google app engine & google web toolkit. User s guide for the plugin is http://code.google.com/intl/tr-TR/eclipse/docs/users_guide.html
To those who wonders what is the relationship bw GAE and GWT, like me:
gwt-windows-1.6.4\samples is a good point for warming up!
to be continued..