My two most popular scripts are my quest book and anti lag system for RPG Maker XP.
I have created an information article on my Anti Event Lag System which contains the information you can find in my topics about it on various RPG Maker forums.
Bear in mind that I am new to google's semi WYSIWYG editor. (There are some postprocessing done, so what you get is not entirely evident)
If you copy any script snippets be sure to check that they copy properly. Sometimes you copy something other than what you expect and in that case there is a big change of the script failing.
I'll do the Questbook next unless I stumble upon something interesting.