Here's a few sites that are offering live online feeds of the '09 Inauguration:
http://www.msnbc.msn.com/id/27721638/
http://www.cnn.com/video/?iref=videoglobal (Click the Live Video link)
http://abcnews.go.com/
http://www.cbsnews.com/
http://www.foxnews.com/ (Click the red
Watch Live link below the main photo)
I also put together a little page with the MSNBC Live Feed and some Inauguration widgets:
http://www.cogonline.net/index.php?page=inauguration