Looks like the Great Firewall or something like it is preventing you from completely loading www.skritter.com because it is hosted on Google App Engine, which is periodically blocked. Try instead our mirror:
This might also be caused by an internet filter, such as SafeEyes. If you have such a filter installed, try adding appspot.com to the list of allowed domains.
This is a beginner-level textbook that focuses solely on teaching students characters. It is intended to be used alongside the Character Text and the book of notes and exercises. We've broken the book up into 22 "weeks" of one page (5 characters) per weekday, currently only with the first 110 pages of 129.
Chinese Primer Character Text (中文入门), First Edition. Written by Ta-tuan Ch'en, Perry Link, Yih-Jian Tai, and Hai-Tao Tang. Published in 2007 by Princeton University Press. Contains 129 pages and 545 characters. There is a 2007 edition with minimal changes.