The thread for the Expressions Quickstart tutorials was lost in one of the server upgrades, so I'm reposting the tutorials here.
Abs_RGB_Expression_functions.zip
circular_orbit_Expressions.zip
Propeller_using_Expressions_04_06_2011.zip
Controlling_bone_rotation_with_Expressions.zip
Controlling_bone_scaling_behavior_with_Expressions.zip
exponential_decay_tutorial.zip
Expression_Boolean_Operators.zip
If_Then_Expression_function.zip
MaxMinRoundExpressionFunctions.zip
SetFrame_AtTime_GetTime.zip
wheel_expression_Marcos_2_21_2011.zip
wheel_rig_path_04_30_2011.zip