David Sanchez of PINT, Inc. wrote a great post on the Sports Marketing 2.0 webpage that describes how teams are losing potential revenue/ traffic hits by not registering all of their relevant domain names.
Think about it. How many persons might misspell your domain name during a search and inevitably give up? In the article, David suggests that teams should purchase all of the potential domain names for their site (which range from $1.99 to $40.00 per month) in an effort to generate more traffic and help users find their site.
Consider having your organization pay an outside company to perform a domain audit to investigate misspellings, international domains, domain name suggestions, and more. It may be worth your while!
Also, when you have a moment check out Pat Coyle's Sports 2.0 social networking community!