There is the Acknex Magazin with many issues and a huge collection of step by step tutorials and tips, there is the Resource Site, there are the magnificent tutorials from the user Kinji (now Kinji_2007).
The links to the first two are at the bottom of the forum's page, called "resources" and "magazine". Don't know where the Kinji tutorials are hosted at the moment.

EDIT: These are not about programming about Lite-C but C-Script, what is the older still common script language of the engine.