Office Web Apps are online companions to Word, Excel, PowerPoint, and OneNote giving you the freedom to work on Microsoft Office documents with browsers. This screencast gives a high-level overview of the requirements to deploy Office Web Apps in a SharePoint environment, what is a SkyDrive, how you can experience Office Web Apps today, etc. Additional information is also available from the post, Office Web Apps with SharePoint 2010 or SkyDrive Explained.