Yikes - IE 8 really crashes. Here's the console output from IE9 developer tools when changed into IE8 Standards mode:

  SCRIPT438: Object doesn't support property or method 'indexOf' 
  github-badge.js, line 59 character 7

  SCRIPT438: Object doesn't support this property or method 
  badge.js, line 47 character 7

  SCRIPT438: Object doesn't support property or method 'getElementsByClassName' 
  embed.js?pname=wordpress&pver=2.61, line 35 character 78

  SCRIPT438: Object doesn't support property or method 'getElementsByClassName' 
  embed.js?pname=wordpress&pver=2.61, line 35 character 78

So, hopefully that gives you a starting point. The IE9 developer tools are much improved over previous iterations.

Interestingly enough, when I switched it into IE7 mode, only the first two errors appeared.

Thanks! I've queued this for a closer look.

Its still crashing..