Psychological Statistics - Materials for an undergraduate course include lecture notes and assignments. Uses MiniTab.
Patrick J. Curran - Quantitative psychologist provides his papers, technical appendicies, and resources on longitudinal methodology.
PsychInfo: Using SPSS - Introduction to the software and step-by-step instructions on performing the basic steps needed to analyze and understand data.
Statistics Primer - Online presentation gives an overview of basic concepts in descriptive and inferential statistics.
Which test? - Questions assist in selecting an appropriate statistical test.
Statpage - Handouts (PDF) detailing when and how to perform and write about many common statistical tests. Uses SPSS.