(from Soule Mama's Handmade Home) for their correspondence. Sometimes we sit down and write to grandparents, cousins and friends. Both boys love having the old replies and postcards to reread "I'm just rewinding my memories" my 7 year old told me after reading them one day. So sweet.
Another thing they like is to write on post it notes and stick them on things. Or reminder notes to stick on the fridge. Our perfectionist child wouldn't write anything for a long time because he hated making mistakes. He has no problem with it any more but for a while I gave him stickers to cover up any errors. It seemed to make him way less inclined to screw up the whole thing and have a melt down.
The note writing thing worked well for him because to write a little "muffins for the zoo" note on the fridge was much less threatening than a letter or a story. They've also enjoyed writing menus and shopping lists and lists of toys they'd like!!
If you're wanting more ideas to encourage your kids writing try these sites...
Some old blog posts of mine about writing