SpellingRules.ie is a site that teaches spelling rules in a dyslexia-friendly way.
You can read how the rules work, listen to examples, and play some games to see if you've got them right.
Check it out, and if you like it, let us know!
Note: The application might take a moment or two to load, depending on your internet speed. If you have problems viewing it, you might need to update Adobe Flash Player.