Mobile Wireframes And Stencils

As mentioned before I am currently developing a mobile strategy and I was looking to find wireframes and  stencils in order to come up with something that makes sense. It was an unsuccessful search until I saw that Graffletopia offered it here. The problem is: I am the stupid Microsoft guy and Omnigraffle only runs on Macs.

Darn...can the information architect community please use Visio one of these days? Or should I steal my wife's Mac, which probably will crash if I install Omnigraffle.