Brilliant! Gets you started with writing. Set yourself a target - how many words / how many minutes and start writing. If you pause you start to lose words you've already written.
Free version of Word Magnets. Really useful especially if you have an interactive whiteboard. Lots of different ways of arranging letters into words, categories, order, etc. And of course you can arrange whole words too. (Don't click on the Word Magnets 2 link unless you want the paid-for site licence - but if you do it's a great site to support)
Comprehensive article about the teaching and learning of English spelling. Special focus on teaching spelling to English language learners (particularly Arabic speaking adults) but useful for all.