What iPad Apps and Why?

I'm sending out an all call.  What iPad apps do you use and why?  How do you use them? Having just recently acquired my first iPad, I'm exploring all the ways this machine can benefit my life and ministry.  I'm curious what folk out there are using.  What apps ought I to look at?

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Got an iPad

As the title says, I finally have an iPad. The church voted last Sunday to reallocate some funds for this purpose. Now learn how to use this thing.