I tend to use Omnigraffle just cause my office can get licenses
easily. The YUI Stencil kit is also a handy companion to whatever tool
you end up using http://developer.yahoo.com/ypatterns/about/stencils/
-Mat
I prefer paper prototyping but I guess it depends on your
requirements. This is a good book.
http://www.amazon.com/Paper-Prototyping-Interfaces-Interactive-Technologies/dp/1558608702
--
Jason Yates
jay...@gmail.com