Hmmm .. searching for "Don Quixote" as title or "Cervantes" as author just hangs on "Searching publications ..." for maybe a minute and then I get a "No publications match your filters" message (although I got search results for these earlier). Same with "Plato", nothing matches. Ah, but I do get a result for "Ambrose Bierce" and for the "Bible". So maybe it's a matter of things still getting indexed, but it doesn't yet feel like the complete Project Gutenberg is getting found in the searches.