Apple just aired their first iPad commercial during the 82nd Annual Academy Awards. A description of the ad by Doju:
The commercial was just on, depicted a person using the iPad on their lap, going through the various features (iBooks, Pages, Videos, etc. nothing new) with an upbeat song.
The ad ends with "April 3."
The Apple iPad will launch on April 3rd with pre-orders starting on March 12th.
Meanwhile, Steve Jobs is said to be spotted at the Oscars tonight as well. Confirmed by another attendant:

Photo by Jon Chu
Update: High quality version of ad available now at Apple.com.