Is StumbleUpon Advertising the next Google Adsense?

If you don't know what StumbleUpon is, imagine a remote control for the internet. You can use it to channel surf the web and 'Stumble' upon all kinds of things that interest you. You also have the ability to give something a thumbs-up or thumbs-down based on what you like, and this improves the systems ability to feed you content you will like. So-- StumbleUpon Advertising (Stumbleads) is the contextual deployment of sites in front of users WHEN they choose, ABOUT topics they choose. It only makes sense. If I've said that I like sports, soccer, and shopping, then it would be only natural for SU to show me an advertisers page with (and here's the key) CONTENT that interests me: Like the newest Shoe from Nike. Not just a page with an e-commerce engine for me to buy the shoe-- I would give that a thumbs-down, but a page with interesting content ABOUT the shoe that I will read, share, and the MAY lead to a purchase.

How does it work?

If you're a media buyer, you're probably crying now. How hard will it be to not only convince a client that they should be doing this, but that their normal methodology won't work! They need to create valuable and interesting content to cut through the clutter. If they do it right, they will benefit from the 'StumbleUpon Effect' which is a long-tail like future for site traffic, and if they do it REALLY well, then they will enjoy other effects too, as all these savvy users of SU also use Reddit, Digg!, and Delicious.

Prepare to be crushed when you try to explain to your client that their existing website just "isn't cool enough" and doesn't offer enough

1-second-value

to the reader to engage them in a channel-surfing web world.