Essentially from the same source as earlier today, but ah, it's nice to see in the know people agreeing with me on SWT/Swing:

What is SWT? Think of SWT as AWT "done right."
This design was intentional -- it leverages existing native toolkits and provides tighter integration. When an SWT button is created in Windows, it creates a native Windows button; on the Mac, it creates a native Mac button using Carbon. When Microsoft released Windows XP with skinning support, SWT got that behavior for free just like all of the other native Windows applications. Things like drag and drop or embedding in other applications tend to be much more straightforward with native toolkits.

Yes, SWT is less feature-rich than Swing, and SWT is not nearly as flexible. However, you still have a great deal of power, evidenced by the fact that Eclipse itself is built atop SWT. Indeed, if initial response is any indication, developers agree.