I should have my iPhone 3G in about 15 days or so. I have tried reading up on jailbreaking, and the biggest negative I see is that you cannot upgrade to the latest software as easily. However, it would be cool to be able to play NES Emulator on my iPhone and change the background on the menu screen. But I'm just not sure if that is worth it. With the new app store we can download things from the store just as easy. What are the pros and cons?