Stephen Fry has been posting video and images from his brand new iPad this evening, but one set of images has been particularly revealing. Fry posted a screenshot from the app revealing that Autodesk SketchBook Pro is already available for the iPad:
Autodesk does currently have a mobile version of their Sketchbook App for iPhone and iPod Touch, but a Pro version taking advantage of the iPad's larger screen is intriguing.
Meanwhile, MGS Development has posted images revealing their upcoming sheet music app for the iPad called forScore:

ForScore will come with over 1300 pages of score, from 18 world-renowned composers, and almost 300 different pieces. The app will include the ability to make notes to yourself as well as a visual metronome. No word on pricing.