I learn things from Google.com every day, and today, I was typing very fast and typed Googel, and before my mind could process it, I had hit the CTRL + Enter keys.  I expected to have to retype it, but it was redirected to the correct url.  What a great plan.  Knowing that malicious sites would pop up with spellings close to Google, they bought these common misspellings and redirect them.  Other sites could learn from them.  Check out these sites:

http://www.gogle.com
http://www.gooogle.com
http://www.googel.com