In case you’re wondering what Office Web Apps is, it is Microsoft Office (Word, Excel, PowerPoint & OneNote) running in the cloud. In competitive terms, this is the Microsoft’s free version of Google Docs but only better! As announced recently, Office Web Apps now available worldwide in more than 190 countries.
You could do a lot of cool things with Office Web Apps like embedding presentations in your blog similar to the below one. So head over to http://skydrive.live.com and enjoy!