Share your favorite iPad or iPhone apps and why :)

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I am so excited to get my hands on an iPad. I don't own and iTouch, iPhone, and neither do I have a netbook. So the iPad will be all three for me, ok except for the phone part :) I've heard how a lot of people have enjoyed Plants v Zombies and Angry Birds on these gadgets. Any other apps that you can recommend? I'd highly appreciate it!