We are looking at ways to integrate the new Teachers Without Borders site with Google docs.
Turns out that you can open: documents - .pdf, .doc, .txt, .html, .rtf and .odt spreadsheets - .xls, .csv, .ods presentations - .ppt
By feeding the file url to this google url:
Here's an example if you needed to view a W4 form from the IRS url:
Use this url: