Please Introduce Yourself

It is rather ironic that in this flood of technologies and web services that are social centric, so many are missing the most basic of social components.  An introduction.

If you are a new company, make sure that when someone lands on your site for your ground breaking new product or service, you explain how the user will use the service or how the product will enhance their life. Don't make them suffer through the registration process and force them to experiment with your service to determine if it is meaningful. 

FriendFeed and Plaxo do this well. They even include a tour or video that shows you how the site works.