Android handsets are more than capable to use for serious business, particularly with Documents To Go from Dataviz. Documents To Go let you view, edit and create Microsoft Word, Excel and PowerPoint files. Also, view Adobe PDF files. Now, version 2.0 is available and adds the following new features:
Also included with the 2.0 update are free versions of Word and Excel viewers. Try out the free viewers by downloading at the Android Market.
Source: Android Authority