I have created an e-mail list specifically for users of the Perple_X program suite, or, indeed for users of any of the other various programs used for calculating and displaying phase diagrams, phase equilibria, and thermodynamic data. Please join if this is of interest to you. If any of you geo bloggers assign your students problems using any of these programs, please encourage them to join the list. It is my hope that having a discussion list with a reasonably high percentage of students present will help make everyone comfortable with posting questions to the list. The creator of the program says that he would like to see the archives of such a list be used as a resource to help everyone who has questions.