I’ve been involved in some mobile application development and have had the need to test a site and application with many mobile devices. During this process I have found two good iOS emulators.
http://www.electricplum.com/
and
http://code.google.com/p/ibbdemo2/
I just recently learned that the ibbdemo2 was replaced by the electric plum version above. I found these to be great emulators and tools to use while testing mobile optimized sites.
You can see that I pulled up my blog and it displays in the mobile version and not the full site.