This has been a hot topic for some of my customers and I’m very happy to see it’s release. The whitepaper for Client Virtualization can be found here.
Products from both Microsoft and Citrix are detailed in the paper including Remote Desktop Services (RDS), App-V, and Citrix’s XenDesktop and XenApp. The paper goes on to describe 3 different options for virtualization Full Desktop Remoting, Application Remoting, and Application Streaming.
…cut/paste from whitepaper…
Full Desktop Remoting
Application Streaming 
Sharing PowerPoint Presentations
Desk phone paired using USBR
 Application Streaming was verified on Microsoft products. For details, see the “Vendor Support” section earlier in whitepaper. Audio is supported only in a VDI environment. Audio is not supported in a session-based desktop delivery environment such as Microsoft RDS. Communication modes for Online Meetings are limited by peer-to-peer communication modes supported for the specified architecture. For example, if audio is not supported on the specified architecture, audio will not work in Online Meetings. Joining online meetings from Microsoft Outlook meeting reminder and/or meeting invitation is not supported.