Google Doc Embedder lets you embed MS Office, PDF, and many other file types in a web page
using the Google Docs Viewer (no Flash or PDF browser plug-ins
required). This plug-in is entirely free and open-source (GPL) and there is no need to pay for it.

Should you find the plug-in useful, however, and wish to donate a buck or two to a starving college student, I would not refuse your generosity. ;) However, feel free to get something for nothing, as well. You don’t get that opportunity often, hey?