Wordpress.com owners Automattic, working in conjunction with Answers.com and former Wordpress core developer Alex King have just released a new plugin which allows Wordpress.com users, and Wordpress.org users to easily link to topics and definitions on Answers.com.
There are literally hundreds of such plugins for linking to various Wikis and shopping sites, but for some strange reason those haven't been included on Wordpress.com
Users on Wordpress.com aren't really very SEO savvy and thus are most likely to be "link happy" and of course with the plugin being so convenient, they are more likely to link to Answers.com now than rival sites.
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