Ever wonder what model BlackBerry Barack Obama uses or where Reese Witherspoon gets her hair done?

Check out what may be a near-perfect mashup of celebrity obsession, rabid consumerism, and Web 2.0 functionality: Coolspotters.com.

Launched on Wednesday, the site helps you identify—and eventually buy—virtually any product featured in your favorite shows and movies or used by a celebrity.

"What Coolspotters is an association engine," explains Eric Kirsten, a co-founder of the company that started the site. "You can create profiles and associate nearly anything in pop culture."

Here's how it works: Users can create (or edit) a profile page for any celebrity, movie, product, or brand of their choosing—sort of like Wikipedia, but for pop culture. But Coolspotters takes the information indexing one step further by creating pages for the intersection of two profile pages, called spots.

For example, a Lotus Elise is featured in Iron Man, so that becomes a spot. If Mandy Moore is photographed in a Prius, that's a spot too.

While the beta version of Coolspotters doesn't include links to buying products, a big "buy me" button will soon appear on profile pages, directing users to one or more online retailers.

For brands as well as consumers, it is a breakthrough in the way celebrities can be associated with products.

"Promotionally it is a really innovative tool," says Marc Gobé, president of branding think tank Emotional Branding. "You have a photo of a celebrity carrying an iPod in their real life and it's a lot better than a paid endorsement. It brings a lot of authenticity and truth to the thing. It's reality branding."

There are magazines that bridge entertainment and shopping, but as a wiki, or a collaborative website, Coolspotters is different. Its users, not editors, make the connections, potentially allowing the site to be an instant, up-to-the-minute snapshot of consumers' tastes.

Of course, cataloging the fashion and product choices of the rich and famous is not the same as inspiring a purchase. The fact that Steve Jobs wears 501 jeans  would probably not set off a stampede at the Levi's store. But seeing that the cool phone that James Bond used in Casino Royale is a Sony Ericsson M600? Now that's a hot product that someone just has to have.

Like anything wiki, Coolspotters depends on the credibility of its users.