Although I am still firmly in the happy Android camp, I do appreciate that very many people indeed have iPhones and that they may well be visitors to sites that I design for clients. Until now I have had to ask my daughter to look at sites and let me know if there are any problems but I've just discovered a little bit if software called ibbdemo3.
You'll need to have the latest version of Adobe Air but this is useful anyway and free. Then download ibbdemo3 and you can check out web addresses on a Windows machine. The iPhone / iPad emulator works a treat and could save a lot of time and errors!
Pressing Ctr1 will also display as an iPad and Ctr→ switches between portrait and landscape. Great!