It should come as no surprise that both Palm webOS and Google Android want iPhone developers on their platform. Mac developers have long been as passionate about their platform and incredibly talented in the apps they've delivered, and a lot of that has transferred over to iOS devices like the iPhone and now iPad.
Whether or not Apple is engaged in a platform war with Palm and Google it's inarguable that the current generation of users want apps and right now Apple has an advantage in that area. Part of getting people to switch to another platform is making sure the apps they love are on that platform, and that means big name apps and fan favorites alike.