Office Web Applications is a new web based productivity offering in Microsoft Office 2010 suite. You can watch the demo here: Demo of the Office Web Apps
Office Web Apps services include companions to Microsoft Word 2010, Microsoft Excel 2010, Microsoft PowerPoint 2010, and Microsoft OneNote 2010. These would be available on Windows Live at no cost to users as an ad-supported service (read: Office Web Apps Coming to Windows Live). For enterprise users, it can be hosted on SharePoint 2010 (SharePoint Foundation 2010 or the SharePoint Server 2010) either on-premise or online.
Read The Office Web Apps Love Your Browser for more details.
Office Web Applications works whether or not Silverlight is installed on the machine. With Silverlight, the user experience gets better. For example:
Read Under the Hood: Find in the Word Web App Viewer and The Office Web Apps Love Your Browser posts for more details.
Deploying Office Web Applications
Refer the Deploy Office Web Apps document available on the Microsoft Download Center. Deploying Office Web Apps involves three primary phases:
PowerPoint Broadcast Slide Show feature
The functionality provided by the PowerPoint Web Application, also enables the PowerPoint Broadcast Slide Show feature. This is a new feature in Microsoft Office 2010 that enables presenters to broadcast a slide show from PowerPoint 2010 to remote viewers who watch in a Web browser. Broadcast Slide Show gives organizations options to provide broadcast slideshow services to users either as an internally-hosted service or as a service accessed over the Internet.
Broadcast Slide Show and Microsoft Live Meeting are complementary technologies, each providing a different level of functionality and end-user experience.
Broadcast Slide Show
Microsoft Live Meeting
Included in Office PowerPoint 2010
Available with or without internally hosted server
Internally hosted or through an externally hosted service
PowerPoint slide show only
Any desktop application
Just-in-time shared slideshows
Broad communication and collaboration capabilities
You want a low-infrastructure solution for impromptu slideshow broadcasts
You want a complete Web conferencing solution with collaboration tools
To learn more about deploying Broadcast Slide Show, refer to the Deploying Broadcast Slide Show document.