ui designer tools collection

http://www.oschina.net/news/16527/21-free-ui-tools-resources-websites 

21个免费的UI界面设计工具、资源及网站

http://www.teehanlax.com/blog/iphone-gui-psd-v4/    

Phone GUI PSD Version 4

http://www.droiddraw.org/

DroidDraw Beta

 good to download

http://www.uimaker.com/