Parking this here for posterity. From C-SPAN - President Obama's inauguration and address.
If you'd rather read or listen than watch, skip over to Transcript of Barack Obama's Inaugural Address on NPR.org. (I was looking for it on the newly remodeled http://www.whitehouse.gov/, but I couldn't find it there. Soon, I'm sure.)
PS a day later: Sure enough, here is the inaugural address in text and video on whitehouse.gov.