4 of 6Image
Normally a music program wouldn't be on a list of visual apps, but Apple has optimized GarageBand to take full advantage of the Retina Display. It is a full featured music creation tool that looks really good.
$4.99 in iTunes
The Autodesk folks have created SketchBook Ink, a sophisticated drawing program that really pops on the Retina Display. It is designed for both the casual artist and the pro alike. In the short video below an artist creates a stunning work of art at the iPad launch event.
Price TBD by Autodesk
Major game producers will be updating graphics in existing iPad games to take advantage of the Retina Display, and EA has committed to do so for the outstanding Mass Effect Infiltrator game. This is already one of the best graphic examples on the older iPad, and should be stunning with updated graphics. This should be coming soon in an update.
$6.99 on iTunes