Ironically, it's a response to an open letter to RIM about how difficult it is to use their PlayBook developer tools. I was doing other things when I noticed that page will still loading, so I took a quick peak into the html, and saw this:
This should go without saying, but don't do that! That's not the only offense, but certainly the most costly in terms of loading a page. There is actually another section that reference jquery locally, so I'm not sure how that got in there, but it has a pretty huge negative impact to have to download the unminified version of jquery from jquery.com.