The Republic as a Metic Space
In Plato's presentation of Athenian democracy in a metic frame, Athenian membership re-emerges as a question, not a given, for political life.
Metaphor and the fallacy of conversion
Joshua Landy just posted a very interesting blog entry here, partly on how the fallacy of conversion tends to work in Derridean argument.  I am no longer enchanted by Derrida -- I've been... deconverted? deprogrammed? -- but I was prompted to defend him in the comments to that post.