Bit of perspective...
Remember, Apple are a completely new player to this market, with only a single model phone unlike the other makers who have a large range, and who have also been in the market for several years to several decades now.
Apple's iPhone is also pitched at a certain section of the market, the Smartphone market, which i'm pretty sure is probably the smallest part of the overall phone market share. That said if they lower the price on the iPhone it will greatly advantage them.
Sony going PSP Phones is actually not -too- far off what is sort of happening with them now offering Skype for PSP Lites. Sony Ericsson phones took a lot of market share from Nokia, but I think some less than reliable models from Sony Ericsson and some strong new models from Nokia have resulted in a reverse swing back to Nokia.
I'm surprised Motorola is still selling as many as they do, they make some okay phones, but aside from the RAZR products its not often to see a standout product from them.