– Debugging tool which can examines the component tree of your GWT application. Demo.

GWTCOMP – Another GWT component library. Widgets include DataEntryPanel, EventfulFileUpload, WizardPanel, and SuperTable.

GWTiger – GWT Library for Enterprise Application Development. Mask Demo.

Got a good GWT related link? Let me know in the comments and I’ll post it.

Fred Sauer has released the next version of his excellent .

• More intuitive drop target selection (for the end user) when there are multiple eligible targets.
• Improved insert position detection for drop targets using HorizontalPanel, VerticalPanel, IndexedFlowPanel, etc.
• Dragging initiated only by first (~left) mouse button.
• Text selections automatically canceled on drag start.
• New image dragging demo – there be pumpkins!
• Better looking cross-browser/platform wrapping in FlowPanel demo.
• Dragging images, anchors and so on made much easier out of the box; see PuzzleExample.java.
• Library fully updated for GWT 1.4.59 (1.4RC2).
• PickupDragController now supports SimplePanel containers out of the box.
• Allow drag controllers ability to designate their own DropControllerCollection implementations.

Make sure to check out the demos!

Ed Burnette has posted on his blog, a review of David Geary’s GWT book, Google Web Toolkit Solutions.   The book seems to be aimed for the intermediate GWT developer.

The format of the book is long code examples with follow-up discussion and tips scattered throughout. This makes for interesting reading and helped me discover quite a few new techniques. The only downside is that the discussion of some features is spread out over different examples and chapters, which made it easy to forget where I found something and difficult to focus in on help with a specific feature. The examples are written using version 1.3.3 of GWT, but the authors note areas where the upcoming 1.4 version fixes bugs and improves on functionality.

David Geary has also written one other GWT book (e-book only), called Google Web Toolkit Solutions Cool & Useful stuff.