WebMynd, a Y Combinator company that launched early last year, has released a new plugin that is looking to streamline the way you search. The plugin, which is available for Firefox and Internet Explorer, enhances the search results on most popular search engines by inserting a handy sidebar with related search results from a variety of other sites. You can test out a web-based version of the feature here, or download the plugin on the site’s homepage.

WebMynd isn’t the first browser plugin to offer complementary results from other sites, but what it lacks in originally it makes up for with its polished execution. After installing the plugin, users simply visit one of the supported search engines (which include Google, Yahoo, and Live Search), and search for a query as usual. The plugin inserts a handful of small widgets at the right hand of the screen, each of which includes the first few matches of the same query from sites like Twitter, Amazon, or Digg. Users can choose from over 25 different search sites that they’d like to include in their results. The inserted widgets take some getting used to, but in practice they’re surprisingly useful.