My archiving post got good results. If you want to cite a webpage (in an academic paper, say) and you want to do your best to ensure that the URL you provide will live – even if the page you link goes away – best practices would seem to be: submit the page to WebCite. It’s easy! I tried it. Also, if the Wayback Machine at the Internet Archive knows about your page, that’s probably good enough as well. It’s interesting: neither of these archives really has extensive search capabilities. You wouldn’t use them to find something. But stuff is kept there. By contrast, google is for finding, but not for keeping.
Also, it turns out the Internet Archive has a great vintage trailer for one of my all time favorite films: The 5,000 Fingers of Dr. T!