For any UK primary teachers currently delivering the Letters and Sounds programme, I have uploaded a "Tricky Words" interactive whiteboard resource that you can use in your lessons.
http://scratch.mit.edu/projects/Mayhem/87585
It lets you choose the earliest and latest phases (from 2 to 5) that you want to draw words from, and then randomly displays a word from that range.
Hope you find it useful!
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