Unfortunately the X-Frame header, that is added by the Office Web Apps service, prevents Internet Explorer to render office documents in an I-Frame! To solve this we've create a very simple HttpModule that checks for the header and changes the value from "DENY" to "SAMEORIGIN". This post simply shows the code for such a module that enables previewing of documents with Office Web Apps inside an I-Frame....
Last Januari I was presenting at the SharePoint Connections 2010 in Amsterdam. As a non Microsoft speaker they do not record your presentation so I decided to create a screencast on the subject myself. I'm not very good at screencasts but it does contain some useful information and some nice code samples....