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While I use Tripit Pro for itinerary management, I also like using Kayak. Kayak works better for making plans and also looks fabulous on the Apple iPad.
I just recently discovered IA Writer and am enjoying the focused writing experience on my iPad, especially when combined with a ZAGG Bluetooth keyboard.
It is important to backup your content and while I have many different cloud accounts, my preferred solution is Skydrive from Microsoft.