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Please see this thread for topics to avoid:

While 9/11 is pretty much off-limits @ news.ycombinator, their "In Comments" section has some good advice:

Please be familiar with the FAQ:

Technical guidelines for posts:

1. No URL shorteners. Please post direct links only. URL shorteners prevent the reader from knowing information about the domain they are clicking on. If you want to use a URL shortener for analytical purposes, you can instead make a perma link to the content on the same domain that hosts it and use your server logs. Posts with URL shorteners are almost guaranteed to land in blogs. We reserve the right to replace shortened URLs with the target.

2. Consider 911Blogger a wiki. If you have information to add, please check if there is a already blog which covers it and add a comment.