I have an original iPhone and am upgrading to the iPhone 4. I sync my phone on two computers: at work I sync my contacts, calendar, and notes with Outlook on a PC. At home, I sync photos and music with my MacBook. Each time I sync on either computer, the iPhone is backed up. I want to transfer everything to the new iPhone without losing anything or duplicating calendar events. One issue I encountered once when I had to reset the old iPhone is I had to re-download all the apps I'd bought or downloaded for free. I'm not much of an app junkie, but it was still annoying. Any tips for a seamless transition?