You can use Torque2D to prototype on Windows and then port to iOS. (Or vice versa.) The Windows development is easy enough for beginners. But when you work on iOS, it will require a little more programming expertise to optimize, etc.
Corona can only sign apps for the iTunes App Store when running on a Mac. The Windows version can fully build Android apps though.
I've been using Airplay SDK for Windows and been super happy with it. http://www.airplaysdk.com Not only is it very straightforward to develop with, and well documented, but you can deploy to iDevices directly from PC. It comes with a nice simulator, and also an ARM emulator ( both debuggable). If you're used to Windows development, it's about a billion times easier than developing on a Mac. I tried using XCode and cocos2d, but just couldn't stand the dev environment. I'm using Visual Studio 2008 and C++ and it's such a relief. They have a solution for provisioning, and when you compile and execute your ARM code, it deploys it directly to iTunes and compiles an IPA. I've deployed to iPad, iPad2, iPhone 4, 3gs and 3g all directly from my PC without ever turning on a Mac. So nice! And I can use my beloved Visual Assist for development. Hooray! Better yet, shipping to iPhone is free. Other platforms require a licensing fee ( so if you want to deploy to Android or one of the other supported devices, you can get it done ) This project - http://forums.toucharcade.com/showthread.php?t=91108 - uses Airplay and Box2d. I started about March 25, just getting stuff done in the evenings after the kids go to bed, and on weekends. Most pleasant dev experience I've had in a while.
Another alternative, if you want to code in C++, is Airplay SDK. It has a free "indie" license (for people with an annual turnover of less than $100,000 USD!), which is uncrippled, and will let you release stuff for iOS. I *think* you still need a Mac to do the final app submission to Apple (this might be true of all cross platform SDKs I think?) but you can do everything else under Windows. I haven't used Airplay myself but heard some good things about it. If you want GUI game editor type stuff I second everyone who said Unity [edit: haha doh, I somehow missed your post about Airplay directly above mine tbaldree. So can you submit an Airplay made app to Apple from within Windows?]
You still have to use the Application Uploader to send the binary ( there's no Windows version of that ), but you shouldn't have to compile on a Mac. So I guess, you can squeak by just borrowing someone's laptop for an hour or two to upload -
