The first IntelliJ IDEA 9.0.2 EAP build will add support for UiBinder, new functionality introduced in GWT 2.0. IntelliJ IDEA will understand tags and attributes in ui.xml files:
Inconsistencies between ui.xml file and associated Java class will be highlighted:
You can jump from field to the corresponding tag by using icon on the gutter:
Also IDE provides actions to quickly create new ui.xml file with associated Java class (in Edit | New | Google Web Toolkit menu) and to generate @UiHandler method (in Code | Generate menu).
Expect new version EAP to be published shortly.