The site doesn't use much js itself (other than to wrap the images which sometimes seems to look like a rebuild). I should probably just modify the textile formatter to do that...
The bulk of the js is disqus and a code pretty printer.
You are doing 20 requests to external Javascripts and 8 requests to external stylesheets according YSlow. "The page has a total of 61 HTTP requests and a total weight of 637.2K bytes with empty cache".
When I read about performance issues I just wondered why you are including all this stuff. That's why I prefer optimizations in the first place before reinventing the wheel ;)
The bulk of the js is disqus and a code pretty printer.
For actual performance it seems to be doing pretty well for me. See here for a before/after: http://steve-lacey.com/2011/04/perf_improvement