Business apps for the iPad?

Question

iOS

By chance, I received an iPad for temporary use and a small budget "to get acquainted with the proposed solutions for iOS in terms of business applications."
What applications do you know that it really makes sense to get acquainted with? Interested primarily in office solutions (office suites or separate text processors, tables).
In addition, programs with a very good interface or a successful implementation of the concept of a simple finger control of any orientation are accepted for consideration.
Angry Birds do not offer (already downloaded).

Answer 1

First of all, the iWork package from Apple itself (Pages, Numbers, Keynote).

Answer 2

E*trade, everything from Omni, Bento, Bloomberg, Mind Meister (now free by the way), Do something yourself.

Answer 3

official Twitter for iPad (nice concept of multiple panels);
Eyewitness, Godville, Dropbox (I like the placement of components and showing the hierarchy of objects using the entire iPad);
oddly iBooks :)