We are 5 months into 2011, yet I’m amazed at the number of websites that are still displaying last year’s date. When this happens, the site appears old and outdated. Make sure copyright dates on your site are up to date. The same is true with any files containing dates.
Go through the date references in all your online articles, sales pages, press releases etc. and make sure they are up to date.
If you are running an e-commerce site, make sure the selection list of credit card expiry dates has 2010 removed.