Look at 1:19 of the first video: http://www.youtube.com/watch?v=Kpi6aTv5o68.
Is it as accurate as one might need it for drawing?
I would prefer it over my wacom, because I like to see the line right at my pencil...

http://www.puppenheim.org/
http://www.wuerfels-welt.de
Old Game Tutorial: http://www.puppenheim.org/MITutorial.zip
Free Game Editor: http://puppenheim.org/AlienalsWeihnachtsmann.zip
http://www.puppenheim.org/blender_starting_main_settings.txt