The 2011 Forward prize shortlist has been announced. It's an anniversary year: the prize is celebrating its 20th birthday. And this year's list oozes quality: former winners Sean O'Brien and David Harsent compete with Whitbread winner John Burnside, Oxford poetry professor Geoffrey Hill, Irish poetry colossus Michael Longley - and OK, D Nurske, a Brooklyn poet of whom I confess I'd never heard until now. But doubtless he's wonderful too. A mighty list then, and nothing to complain about - except for the fact that there aren't any women on it.