Ever since I had the chance to be part of the creative team that produced the uber-successful John Cleese "Institute of Backup Trauma" viral video, I've been a huge fan and booster of the power of small screen programming to entertain, inform, drive traffic & accelerate awareness and revenues.
One of the best wideos (web-videos) I've seen recently is "Social Media ROI: Socialnomics" from Socialnomics' author/creator Erik Qualman. This animation does a great job providing statistical proof of the Return on Investment of social media (or as I like to re-define ROI as "return on interaction).
Erik's masterpiece has all the right elements of an effective wideo:
1) Crisp, simple text treatments
2) Compelling content
3) A catchy, hip rock theme
4) Delivers value to those who watch it
5) Inspires virality
Check it out: