It's arrived! I ordered a Shimano DH-2N72 Dynamo Hub last week and I came back to work this afternoon to find it waiting on my desk. I'm really excited about this piece of kit.
So now I need to look into buying some dynamo lights. I'm thinking about buying either the Lumotech IQ Cyo or a Supernova E3 Pro. They are both pretty dear. The Supernova is supposed to be much brighter, but it is also more expensive. Oh well, I've got some time to sit on it.