In light of my sister’s experience with the airlines, this article caught my eye. Jeff Nolan points to an article, Double trouble: DVT a small, but serious risk, which lists (toward the middle of the article) several flights that required passengers to wait unreasonable amounts of time on the tarmac.
I love the picture on this article.
The Wayback Machine
The Wayback Machine allows you to see history of a page. I found this in an article using it to document the history of Google’s search page. They need to add an RSS feed so that you can get notified when someone updates their page!