I seem to be a bit immobilized at the moment by weather and health but I am trying to make the most of it by reading and working my way through a book called How to Write a Poem by John Redmond. It might seem like quite a basic title but actually I am finding it really useful. The chapter titles are what you would expect from this type of book - basic stuff like "Viewpoint", "Image", "The Question of Voices" etc, but they are well written and each chapter has a writing task at the end related to the chapter that you have just read.
I love this kind of book - I think that however practised a writer you are it doesn't hurt to go back over the basics once in a while. Sometimes you might learn something new or be reminded of something that you have forgotten. I find the writing exercises really helpful too - anything that takes you out of your own thinking rut (and we all have one) has got to be good and occasionally they have inspired a really good poem that I may not have otherwise written.