Are you sure that you want it to be anonymous? I would be (irrationally?) afraid of someone joining just to steal another person's work and submit it as their own sample . And I don't know about anyone else, but I would not feel competent to judge the content of work outside a few select areas (basically Normative Ethics, Free Will, Analytical/historical work on Nietzsche, and maybe some topics in Feminist Philosophy and Mind). So you might need to filter it by area.
Anyway, I would like to do this! My sample is on desire-satisfaction theories of the good.