UPDATE 2017:WRITINGFUN IS NOW A PAID PRODUCT... FEAR NOT AS WE HAVE FOUND A BETTER ALTERNATIVE AT LITERACYIDEAS.COM ALL WRITING GENRES AND TEACHING GUIDANCE CAN BE FOUND THERE AND IS COMPLETELY FREE.
I have been using this site for a number of years now regularly to teach my students about different text types and share examples with them and just realised that I do not have it up on Edgalaxy.
Jenny Eather's Writing Fun is a brilliant tool for any English teacher. It contains step by step instructions on how to construct all major text types such as persuasive, explanatory, narrative and so on and has loads of examples from students to share on your interactive white board.
It also contains a range of planning tools and aids to help your stuidents get the most from their writing sessions. Quite simply this is my number one pick for writing resources and I strongly recommend you check it out here.