What is it? What2learn offers some really simple to create flash based literacy games that you can either get your students to create or simply make the yourself. The game options are very simple in nature offering hangman, wordsearch, question and answers, anagrams and multiple choice but the point of what2leaarn is that students will really appreciate the opportunity to create and share their games with classmates.
How Can I use this in the classroom? It would be reasonable to expect a group of grade 3-4 students to be able to create a game in around 10 - 15 minutes so you could ask them to do this in a literacy rotation without too much hassle. You could ask students to use their weekly spelling words in the games or simply create games based on a theme you are doing in the classroom at them moment.
What2learn is a available here and free of course.