Ultan's Library, a resource website for the study Gene Wolfe, recently republished an essay by Michael Andre-Driussi, called The Death of Catherine the Weal and Other Stories. It was originally published in 1992 and was intended to be a sort of "overture" for the original Lexicon Urthus.
They also have begun constructing a new design for their site which so far looks great. It's always awesome to see well put together sites like this one dedicated to the work of Gene Wolfe. I'll be visiting often.