Folks, mod_speling can also correct minor typographical errors (by trying to match the request with your file names). That makes it a great tool for those webmasters expecting visitors to enter URLs by hand (personally, I prefer to provide a 404 script for that). mod_speling but it is a little-known, fabulous tool from Apache.
Please note that we have spelled the module's name correctly. The Apache people thought it funny to misspell mod_spelling by eliminating one of the L's - I have to agree, although this is a very minor point (of interest).