Ask HN: Is there a list of websites that support OpenSearch anywhere?

OpenSearch seems like a useful tool. I'm building something that could very easily take advantage of websites that are OpenSearch enabled.

Really all it comes down to is parameterizing the search url, eg for Google: "http://google.com/?q={searchTerms}". I'm trying to get as many parameterized searches as possible without having to manually do all the work... importing a list of OpenSearch enabled sites would ease my troubles.

Thanks