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Randomising letters
Some years ago this text circulated on the Internet:
Aoccdrnig to a rscheearch at Cmabrigde Uinervtisy, it deosn't mttaer in waht oredr the ltteers in a wrod are, the olny iprmoetnt tihng is taht the frist and lsat ltteer be at the rghit pclae. The rset can be a toatl mses and you can sitll raed it wouthit porbelm. Tihs is bcuseae the huamn mnid deos not raed ervey lteter by istlef, but the wrod as a wlohe.
I thought that was pretty interesting and tried to find more info on the topic - without luck. According to several sources no such study had been performed at Cambridge University. However, I did find a reference to another source.
Randomising letters in the middle of words has little or no effect on the ability of skilled readers to understand the text.
Reference: Rawlinson, Graham. E. (1976) The significance of letter position in word recognition. Unpublished PhD Thesis, Psychology Department, University of Nottingham, Nottingham UK.