Microsoft Office Tutorials by GCF iPhone app: GCF Word 2010 Tutorial (also Excel and PowerPoint apps)
Caution - no video lessons display on the iPad. Video lessons only work on the iPhone 4.
However, you can see some video lessons by using Safari and going to GCF Word 2010 Tutorial.

Drawing Tools:
HelloCrayons
Drawing Pad
Doodle Buddy

Math:
Calculator (free)
Ruler
3rd Grade AAA Math at http://www.aaamath.com/grade3.htm

Dictionary.com
Word Central at http://wordcentral.com/)

Google Earth
World Atlas at http://www.factmonster.com/atlas/

Wolfram

The Weather Channel

Science@VL (Science Glossary)

Sundry Notes

Animoto

PCS Lite