Create Khan Academy style video tutorials with ScreenChomp — from the digital inspiration blog by Amit Agarwal

Some of the products that Amit mentioned in the posting include:

 

 

*  Also see
Drawing on the iPad: 12 touchscreen styluses reviewed
— from Macworld.com

 

Update / addendum on 4-17-2012 from posting w/ same date:

Sal uses a PC with:

Camtasia Recorder ($200)
SmoothDraw3(Free)
Wacom Bamboo Tablet ($80)

Prior to that, he used:

ScreenVideoRecorder($20)
Microsoft Paint (Free)

Mac users: In lieu of SmoothDraw, Autodesk Sketchbook Express works (free with a Wacom)