Actually a nice article describing what I do a lot of... in no documentation does it describe that JS files must end in JS, or images must end in .gif or jpg, or css files must end in css... what if they all were .php files and you had the IP address of the surfer... what if rather than cloaking an entire page, for example, you only cloaked portions of the JS or CSS files or even the images...?
What kind of trickiness could be had there?

And back to nonBH stuff...
I started using this technique in early 2000 when I had trouble getting a "Please Wait" page to come up with an animated GIF while I processed a transaction. The problem was that if I POSTed something (so that I could start the transaction) the GIF stopped moving in IE... bastards. So my final fix was to jump to a page with an animated GIF that called for a JS src... but THAT was the actual transactor. The page continued to animate but IE held on for as long as it needed to for the "javascript source" to come down... well, as soon as my processing was done the only javascript that it got was "top.location='/thankYouForProcession.html'" ... so the user had the experience of "something's happening" (the animated GIF) while I worked and the moment I was done the site moved on.
/p