Many SEO experts believe that Google penalizes poor spelling, especially the black hat bozos who misspell words on purpose in an effort to rank high on search terms that are regularly misspelled. For example, maybe I want my furniture site to rank high on the search term “furniture.” With all the competition, I have no chance of cracking the first page, but I figure out that a lot of people search for “furnature” by mistakes, so I sprinkle “furnature” into the copy of my site. Now, my site is on first page for any searches for “furnature.”