I love the whole concept of viral video advertising. Imagine, advertising actually intended to be entertaining. It's such a radical concept that it actually got it's own term.
Here's a great one advertising the online Judaica store, Judaica Place. The video was originally posted on Judaicaman.com. I picked it up from the Apple770 blog. Everyone should go buy something from Judaica Place, just as a thank you for brightening our day.