http://www.precentral.net/coming-fal...velopment-easy
There's another option. This company has released a software development environment for making webapps for the iPhone and apps for the Palm Pre.....
They're supposed to be adding support for more mobile platforms in the future.
* iPhone emulator and development environment - no need for the iPhone SDK
* iPhone application development for Windows
* Palm Pre emulator and development environment
* Mobile Web development environment
* Other popular smartphone emulators (coming soon)
* Blackberry Storm simulator (coming soon)
* Google G1 emulator (coming soon)
Looks like it's free to download...or at least try.