Mosaic is the the largest producer of phosphate and second largest producer of potash in the world. Phosphate and potash are the two crop nutrients essential in producing fertilizer, of which Mosaic sold 15.7 million metric tons during the 2008 financial year. As experts on these two ingredients—which made the company $9.8 billion, I might add— one would think that Mosaic's dedicated description of their beloved potash on their company website would be professional and perfectly presented. Wrong.

“Occurring” is spelled with two “c”s and two “r”...they both occur more than you think. Poor potash!

Here are two of a possible 181 errors:

Aditionally Suggestions: Additionally, Additional, Atonally, Emotionally, Optionally 
 (appears 2 times)

occuring Suggestions: occurring, accruing, curing, acquiring, ocarina
 (appears 1 times)

Automatic Data Processing is one of the world's largest providers of business outsourcing solutions. They offer the widest range of HR, payroll, tax and benefits administration solutions from a single source. If you want to join one of their 570,000 clients, you can callllllll 1-800-CALL-ADP. OK, so maybe it's not that bad, but for 18 times throughout the site, one too many “l”s makes for one really bad call.

Here are two of a possible 916 errors:

independance Suggestions: Independence, Independence's 
 (appears 1 times)

calll Suggestions: cal ll, call-ll, call, Calla, Calli
 (appears 18 times)

Progress Energy has more than 21,000 megawatts of generation capacity and $9 billion in annual revenue—the Forbes 500 company serves over 3.1 million customers in North Carolina, South Carolina and Florida alone. But like the many universities in the states who can't even spell their own name right, Progress Energy has trouble progressing in the spelling department—progress, indeed.

Here are two of a possible 1,368 errors:

Progess Suggestions: Progress, Profess, Process, Prowess, Prigs
 (appears 1 times)

Commerical Suggestions: chimerical, Chimaerical, Comical, Clerical, Numerical
 (appears 4 times)

First Data is a payment processing company, sitting at #295 on the Forbes 500 list. Whether you're writing a check, using a debit card, purchasing online, getting cash back from an ATM, using a credit card or cashing in a gift card—if you're in the states, you may well be utilizing the services of First Data. Clearly, First Data are experts in data, and really know their numbers. Words and letters, however, is an area they could use some more knowledge in.

Knowledge, knowledgeable, knowing, knowledgeably, acknowledgments, acknowledged...know your know words! Hint: if you know knowledge, you can know the rest—add “able” for knowledgeable, and “ac” for acknowledge. And no, knowing has never been so easy! 

Here are two of a possible 303 errors:

restuarants Suggestions: restaurants, restaurant's, restaurant, restraints, restraint's
 (appears 1 times)

knowlege Suggestions: knowledge, Knowles, knowledge's, bowleg, College
 (appears 3 times)

In one of the most ironic twists of the spelling world, “success” or some version of it is one of the most commonly misspelled words on Forbes 500 company websites. Huntsman is a global manufacturer of differentiated chemicals, and had revenues exceeding $10 billion in 2008. Its companies produce 33 billion pounds of products, operate from numerous locations across the globe and employs over 1,200 people—all since its founding in 1970. Yet the company portrays something other than success by having over 1,500 spelling errors on the corporate website. An obviously successful company with a not so successful image of success. Don't let this happen to you!

Here are two of a possible 1,865 errors:

succesful Suggestions: successful, successfully, successively, successive
 (appears 2 times)

betweeen Suggestions: between, tween, betaken, betoken, beaten
 (appears 2 times)