I'm about to install SP1 for Windows 7, it seems like it includes a lot of already-installed improvements but it also promises to include "improvements to features and services in Windows 7, such as improved reliability when connecting to HDMI audio devices, printing using the XPS Viewer, and restoring previous folders in Windows Explorer after restarting."
So here we go... and by the way I can definitely use the improved reliability when connecting to HDMI audio devices on my Media Center at home too.