Groupon.com knows how to build a great unsubscribe page for their email newsletter.  Clicking on the unsubscribe link in their email takes you to a webpage confirming you are unsubscribed.  They also express sorrow to see you leave and finally offer a funny video to punish their IT guy responsible for sending out the email.  Adding this bit of humor and the simplicity of the unsubscribe process leaves me with a positive feeling about their company and service.

More about Groupon at YouTube.

Official Groupon.com YouTube Channel