Google Related Links use the power of Google to automatically bring fresh, dynamic and interesting content links to any website. Webmasters can place these units on their site to provide visitors with links to useful information related to the site’s content, including relevant news, searches, and pages.
The idea’s the same: if you put the service on your site, certain words on your site will be accompanied by a small icon which leads to a set of links that are (one hopes) relevant to the context in which the words occurred. It’s all about making money, of course — about turning your text into hotlinks for vendors.
At least with Y!Q there’s a Firefox extension that lets you, the user, decide which terms on which pages should form the context for a search for related links. Mind you, it won’t take but a day or two for a FF extension to show up for Google. I’d point you to a page that uses Google Related Links, so you can see it in action, but there isn’t one mentioned on Google’s announcement of this very beta product.