Be careful when you harvest these, unless you hold your mouth right, they sting. These are some recipes to try. Do not pick them when they are making flowers, nettles will make you ill then. We have a recipe on our wild food blog: http://the3foragers.blogspot.com/2010/04/stinging-nettles.html
Hugh Fearnley-Whittingstall's nettle recipes -- Free and taste like spinach? I have loads of these in my garden, every year. Will have to try when they start growing. A good reason to look forward to February!