From a much-touted study:
I cdnuolt blveiee
taht I cluod aulaclty uesdnatnrd waht I was rdanieg. The
phaonmneal pweor of the hmuan mnid Aoccdrnig to rscheearch at
Cmabrigde Uinervtisy, it deosn’t mttaer in waht oredr the
ltteers in a wrod are, the olny iprmoatnt tihng is taht the
first and last ltteer be in the rghit pclae. The rset can be a
taotl mses and you can still raed it wouthit a porbelm. This
is bcuseae the huamn mnid deos not raed ervey lteter by
istlef, but the wrod as a wlohe.
You may have seen this before, but it is always worth a review. Two upshots come to mind: 1) spelling may not be as important as teachers (such as myself) want you to believe; 2) one suspects that the researchers themselves were poor at spelling. As to the former: a friend of mine claims he once left a girl because she wrote him a love letter full of spelling mistakes.