Webster's Speller: Absolute Favorite!!!!!! And it's free! Poke around this website, read and learn. Webster's Speller teaches children to read syllables, which in turn helps them to spell the syllables correctly. Excellent, by far the best reading curriculum around, IMHO.
NAPLAN 2012 Teaching Strategies: This site provides information and activities for teachers and links to online resources related to spelling, text structure, vocabulary, language conventions, writing, maths and much more!
Dunk-A-Duck online hangman game ~ Cute wise-cracking duck, various word lists, categories and levels of play. Register for free, and you can enter your own word lists (excellent for the weekly spelling tests) Also at this website is WordDuck Word Search online game