I hate hearing that and luckily there is an easy way around it. I can't tell you how many email templates or VF pages I have in my SF instance that had hard-coded dates. The most frequent culprit was a duplicated VF email template with a standard copyright footer.
Rather than hardcode something like:
Copyright ©2005-2011 Acme, LLC. All Rights Reserved
You could specify a floating year like this:
Copyright ©2005-{!year(today())} Acme, LLC. All Rights Reserved
