This is a fun spelling game for younger students. Jump around this platform game collecting letters in the correct order to spell words.
http://ictmagic.wikispaces.com/English
A good flash-based 'guess the letters' game where players have one minute and three wrong guesses to figure out the words.
http://ictmagic.wikispaces.com/English
Enter various words in the different lists. Drag an apple to enlarge the word. This was demonstrated at a TeachMeet as a way for pupils to use certain words in their writing. When they needed to check the spelling, they could come up to the board and enlarge the word they wanted to make it clearer.