Documents To Go Premium Edition 8

the author of this app says:

Use your Word, Excel and PowerPoint files on your handheld anywhere, anytime, with Documents To Go Premium Edition. The latest version includes support for native PDF documents. Users can now open common PDF files. Other native PDF features include support for embedded graphics and tables and included word wrap and page layout options. It also allows multiple zoom levels to explore the details of your file.

You can synchronize password-protected files, pictures and Excel-like charts, and even spell-check your word-processing files.