New iphone must haves... What do you use or can't live w/o?

[weeddigger]

So right now my iphone is on FedEx truck for delivery, and it will hopefully be at my house by the time I get out of my shit hole job...

I have a buddy who says I have to jailbreak it, install nintendo games, sega genesis games, I know there are some music maker apps that I'll be wanting to check out...

What say you guys?

What do you think I should try out? What do you use? What can't you live without?

Thanks!