The Best Answer
If you're going to do anything business related on your iPad, the most obvious thing you'll need is at least one of the iWork apps for the iPad–either Keynote for iPad, Numbers for iPad, or Pages for iPad, depending on the business task.
If you get all 3 apps, you'll pretty much have a full-scale application suite for doing all your business stuff–creating and editing documents (Pages), spreadsheets (Numbers), and presentations (Keynote). In terms of features, this set of iWork apps blows away all the other iPad business application apps, particularly Keynote, which shines within the multitouch interface.
For doing business, you'll definitely want to get the PDF Reader for the iPad. Remember back in the day when the iPhone barely supported .pdf files? Thankfully the iPad bears little resemblance to those days of yesteryear. As far as the app goes, PDF Reader Pro iPad app is made just for the iPad, and does exactly what you'd expect from a great PDF reader.
You can download pdfs from any website straight to your iPad, jump to a specific page, search for keywords, and bookmark pages. You can easily transfer your files via USB. And naturally, the spacious screen size of the iPad makes reading PDF documents pure pleasure.
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