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We occasionally see major spikes in traffic due to robots and spiders on the site. While the traffic is a good thing, it is lower priority. Unfortunately, there is no way to tell apache to work slower on some requests. If we were a smaller site, our Varnish configuration would be sufficient since all of the pages could be cached for anonymous access. Unfortunately, we have a database of 20,000+ nodes that are publicly accessible, and spiders want to see all of them. When the wrong factors line up, it equates to a minor DOS attack.
Here are some of our rejected options:

A few emails came over our Icewarp-powered email list and appeared blank in Outlook 2010. The data was clearly present in the email files, but Outlook refused to render the content.

Our office network performs multiple key functions for the organization. Three key functions are staff Internet access, staff file server access, and async email/backup/automation traffic. Based on our usage levels, we have established two separate Internet connections. Email, backup, and other delay-able traffic uses one connection. All other traffic is driven by human action and runs on the other Internet connection/network.