I don't have a lot of faith they bring in a lot of traffic, but here they are just for fun:
http://hudsonscripting.com/private/misspelling.cgi
this one reverses letters, skips letters, doubles letters and merges on white space.
http://hudsonscripting.com/private/missed_key.cgi
and this is the turbo charged one that gives you all possibilities of missed keys...so for a g you get f,t,y,h,b,v
hehe...by the way, for some strange reason the second one chokes if you enter caps
