WebAssign

First, the shiny new tutorials (with credits and all):

Graphing Lines with WebAssign Graphing Tool
Youtube Link

Graphing Parabolas with WebAssign Graphing Tool
YouTube Link

Graphing Inequalities with WebAssign Graphing Tool
Youtube Link

Graphing Circles with WebAssign Graphing Tool
YouTube Link

Graphing Systems with WebAssign Graphing Tool
YouTube Link

Number Lines with WebAssign Graphing Tool
YouTube Link

* the name WebAssign GraphPad was recently changed to WebAssign Graphing Tool (in case you were wondering)

Here are some older tutorials I made for our faculty and students:

An Orientation to WebAssign Homework (for students)

Using the WebAssign Message Boards (for students)

Creating a New Course in WebAssign

Creating an Assignment in WebAssign

How to Propogate your WebAssign Assignments into a New Course