How about enabling the iPhone users to run the Android on the device. As we all know, iPhone does not support java and Android is completely running on Java technology, but by developing a thin client ( bi-lingual interpreter kind of thing) for iPhone and porting the Android OS to it, wouldnt it be awesome to have Dual Boot iPhone for OS-X and Android !!!

Never gonna happen..... Nice idea though!

iPhone wont even allow Java,Flash,Silverlight. So they would never allow a whole another OS.
But I guess you hack the iPhone and ignore apples rules...

Yeah, this isn't so much an iPhone limitation as it is an Apple limitation.

If you could hack the iPhone to load your own OS on there, no reason you can't load the Android OS. I don't know all the details of how you would even start going about doing that, but I wouldn't recommend trying however: The iPhone has no back button, no call, button, no call end button, no track ball or arrows and no built in keyboard. Putting the Android OS onto the iPhone just wouldn't work out, hardware-wise.

check http://www.xmlvm.org