Can anyone please suggest any good GUI Design Tool apart from Droiddraw?
There are user-contributed controls for balsamiq mockup, the current darling of the UI design world. For an example, visit the android controls on mockups to go.
There's a great Omnigraffle template: http://graffletopia.com/stencils/498
I'm also looking for more tools that can provide a good experience for developing Android user interfaces. I've run across Droid Draw and it does appear to be useful. I'm curious as well to see if there's more out there, perhaps even better, and based on these responses I'm not seeing much. Hopefully there's more people out there that can respond.
Don't forget that the Eclipse plugin has a sort of WYSIWYG layout editor. Just open your layout xml files and click on the "Layout" tab at the bottom of the XML editor. Unless I'm misunderstanding your question.