iPad Apps to Boost the Tablet's Productivity Level - WSJ.com

From a Walt Mossberg review of four iPad productivity suite offerings

"There's a major gap, though: Microsoft Office. The software giant doesn't yet offer a tablet-optimized version. So there are iPad apps that attempt to emulate the features of Office and can import and export files in Microsoft's Office formats. They generally don't offer all of the features of Office and don't always offer perfect fidelity with PC and Mac versions of Office. But I have found they are fine for the basic documents most people create or edit. And all can open and edit Office-type files attached to email, using the iPad's "Open In..." command. You just touch the attachment icon for a bit longer than usual and a grid of compatible apps to use for editing appears."

iPad Apps to Boost the Tablet's Productivity Level - WSJ.com