Below is an interesting email circulating the internet, as interesting (or irritating) emails do. I have come across this theory in a number of guises - it seems we image words in whole bites, not letter by letter. For those of you who read extensively, I wonder if you've ever had this same experience on a paragraph by paragraph basis. I used to read non-fiction this way in college - a version of speed reading.
I cdnuolt blveiee taht I cluod aulaclty uesdnatnrd waht I was rdanieg The phaonmneal pweor of the hmuan mnid Aoccdrnig to rscheearch taem at Cmabrigde Uinervtisy, it deosn't mttaer in waht oredr the ltteers in a wrod are, the olny iprmoatnt tihng is taht the frist and lsat ltteer be in the rghit pclae. The rset can be a taotl mses and you can sitll raed it wouthit a porbelm. Tihs is bcuseae the huamn mnid deos not raed ervey lteter by istlef, but the wrod as a wlohe. Such a cdonition is arppoiately cllaed Typoglycemia :)-
Amzanig huh? Yaeh and yuo awlyas thought slpeling was ipromtnant.