Of course we didn't really seem to accomplish anything by asking a translation service to not
translate a webpage. But in truth, some of the content was proxied through Google's Translate service. Using the Firebug Extension
for Firefox, I was able to see that the request to see the front page of Instructables.com through Google Translate resulted in 26 HTTP requests, and only 3 of them were sent directly to instructables.com (2 for JS, 1 for CSS). So, this isn't a bulletproof method of avoiding ALL requests to the "translated" domain, but most of the content did indeed go through Google's translation services.
But can we make it a bit easier to automate the usage of this tool? Maybe a little bookmarklet?