Collecting embargo policies: What's yours?

If you're issuing news in advance to reporters under an embargo--a protected time during which they can conduct interviews and research, while agreeing not to publish until a certain date and time--I'm looking for your organization's embargo policy.  (If you issue embargoed news but don't have a set policy, that'd be important to know, too.)  Post a link, or a short description if your policy isn't published, below.  You can remain anonymous, but it'd help to know whether your embargo pertains to research published in journals or presented at meetings, major reports on any topic, product announcements, etc.--and what kind of organization or company you work for.

I'm also curious about how, if at all, your policy encompasses bloggers or others covering your topic in social networks.  Does it differ for bloggers, compared to journalists?

My goal is to offer a collection of case studies and models for communicators who haven't worked with embargoes much as well as more seasoned communicators, and those trying to figure out where bloggers fit in.  Please share your knowledge. I'll compile the results in a post so we all can make use of it.